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Auxilliary vs. Auxiliary — Which is Correct Spelling?

Edited by Tayyaba Rehman — By Fiza Rafique — Updated on March 27, 2024
"Auxilliary" is an incorrect spelling of "auxiliary," which refers to providing supplementary or additional support and assistance.
Auxilliary vs. Auxiliary — Which is Correct Spelling?

Which is correct: Auxilliary or Auxiliary

How to spell Auxiliary?


Incorrect Spelling


Correct Spelling

Key Differences

Recall there's only one 'l' after "aux."
Think "aux" followed by "iliary."
Envision a helpful "ally" in "auxiLIARY."
Use mnemonic: “AUXiliary cords support the main audio.”
Associate "aux" with "audio auxiliary" cords.

How Do You Spell Auxiliary Correctly?

Incorrect: The ship's auxilliary engines were activated during the storm.
Correct: The ship's auxiliary engines were activated during the storm.
Incorrect: She volunteers as an auxilliary nurse at the local hospital.
Correct: She volunteers as an auxiliary nurse at the local hospital.
Incorrect: The auxilliary verb is essential in forming the perfect tense.
Correct: The auxiliary verb is essential in forming the perfect tense.
Incorrect: The auxilliary power unit failed to start.
Correct: The auxiliary power unit failed to start.
Incorrect: We need to train more auxilliary staff for the event.
Correct: We need to train more auxiliary staff for the event.

Auxiliary Definitions

A person or thing providing supplementary or additional help and support.
The engine has an auxiliary power source.
A group supporting a bigger organization.
The women's auxiliary raised funds for the hospital.
Providing additional or supplementary support.
The auxiliary troops were called in for reinforcement.
Giving assistance or support; helping.
Acting as a subsidiary; supplementary
The main library and its auxiliary branches.
Held in or used as a reserve
Auxiliary troops.
An auxiliary power generator.
(Nautical) Equipped with a motor as well as sails.
(Grammar) Of, relating to, or being an auxiliary verb.
An individual or group that assists or functions in a supporting capacity
A volunteers' auxiliary at a hospital.
A member of a foreign body of troops serving a country in war.
(Grammar) An auxiliary verb.
A sailing vessel equipped with a motor.
A vessel, such as a supply ship or a tug, that is designed for and used in instances and services other than combat.
Helping; giving assistance or support.
Auxiliary troops
Supplementary or subsidiary.
Held in reserve for exceptional circumstances.
(nautical) Of a ship, having both sails and an engine.
(grammar) Relating to an auxiliary verb.
A person or group that acts in an auxiliary manner.
A sailing vessel equipped with an engine.
A marching band colorguard.
Conferring aid or help; helping; aiding; assisting; subsidiary; as auxiliary troops.
A helper; an assistant; a confederate in some action or enterprise.
A verb which helps to form the voices, modes, and tenses of other verbs; - called, also, an auxiliary verb; as, have, be, may, can, do, must, shall, and will, in English; être and avoir, in French; avere and essere, in Italian; estar and haber, in Spanish.
A quantity introduced for the purpose of simplifying or facilitating some operation, as in equations or trigonometrical formulæ.
Someone who acts as assistant
Functioning in a subsidiary or supporting capacity;
The main library and its auxiliary branches
Relating to something that is added but is not essential;
An ancillary pump
An adjuvant discipline to forms of mysticism
The mind and emotions are auxilliary to each other
Serving in a subsidiary capacity.
She worked in an auxiliary role.
Relating to a verb form that indicates modality, tense, etc.
Can and will are auxiliary verbs.

Auxiliary Meaning in a Sentence

Auxiliary police officers were called in to manage the crowd.
The auxiliary generator kicked in when the power went out.
The community center hired auxiliary staff for the summer programs.
Auxiliary tanks are used to extend the aircraft's range.
The computer's auxiliary memory can store additional data.
The teacher uses auxiliary materials to enhance the curriculum.
The car has an auxiliary port for playing music from a phone.
They installed an auxiliary pump to help prevent flooding.
The band's sound system includes auxiliary speakers for larger venues.
Many languages use auxiliary verbs in complex tense constructions.
The navy's fleet includes several auxiliary vessels for support roles.
Auxiliary fans are often used to improve air circulation in large buildings.
Auxiliary lighting was added to the stage for the concert.
Auxiliary bishops assist the diocesan bishop in his responsibilities.
Auxiliary lanes on the highway help manage traffic flow.
He works as an auxiliary firefighter, supporting the full-time team.
An auxiliary keyboard can be connected for more complex compositions.
The sports team has auxiliary coaches specializing in different areas.
Auxiliary nurses play a crucial role in patient care.
The vehicle comes equipped with an auxiliary heating system.
Auxiliary inputs allow for a variety of devices to be connected to the system.
In grammar, an auxiliary verb helps to form different tenses and moods.
The software includes auxiliary tools for editing and formatting.
The hospital's auxiliary unit provides support services to patients and staff.
An auxiliary cooling system is recommended for high-performance computers.

Auxiliary Idioms & Phrases

Auxiliary unit

A group or system that supports the primary operations.
The auxiliary unit was crucial in ensuring the success of the mission.

Auxiliary equipment

Additional equipment used to support the main system.
The plant's auxiliary equipment helps maintain the production line.

Auxiliary troops

Supplementary soldiers or military forces.
The auxiliary troops were deployed to reinforce the front lines.

Auxiliary verb

A verb used in forming tenses, moods, and voices of other verbs.
Have is an auxiliary verb in the phrase have finished.

Auxiliary power

Backup power used in case of primary power failure.
The auxiliary power system automatically activated during the blackout.

In an auxiliary role

Serving in a support or supplementary position.
She excels in an auxiliary role, providing vital assistance behind the scenes.

Auxiliary services

Services that support the main functions of an organization.
The hospital's auxiliary services include laundry and catering.

Auxiliary force

A force that provides extra strength or support.
The auxiliary force played a key role in the rescue operation.

Auxiliary support

Additional help provided when needed.
The team received auxiliary support from volunteers during the event.

Auxiliary staff

Staff members who provide additional support.
The event organizers relied heavily on auxiliary staff for setup and takedown.

Common Curiosities

What is the root word of auxiliary?

The root word is the Latin "auxilium," which means "help" or "aid."

Which vowel is used before auxiliary?

The vowel "a" is used before "auxiliary."

What is the singular form of auxiliary?

"Auxiliary" is the singular form.

What is the pronunciation of auxiliary?

"Auxiliary" is pronounced as /ɔːɡˈzɪliː.əri/.

Which conjunction is used with auxiliary?

Any conjunction can be used with "auxiliary," such as "and," "or," or "but."

What is the verb form of auxiliary?

"Auxiliary" is primarily an adjective and noun. It doesn’t have a standard verb form.

Why is it called auxiliary?

It's called "auxiliary" from the Latin word "auxilium," meaning "help" or "aid," denoting support or assistance.

Is auxiliary an adverb?

No, "auxiliary" is not an adverb.

Is auxiliary an abstract noun?

In some contexts, "auxiliary" can be considered an abstract noun, especially when referring to support in a general sense.

Is auxiliary a noun or adjective?

"Auxiliary" can be both a noun and an adjective.

Is auxiliary a negative or positive word?

"Auxiliary" is neutral, but the connotation can be positive when referring to support.

Is auxiliary a collective noun?

No, "auxiliary" is not a collective noun.

Is the word auxiliary imperative?

No, "auxiliary" is not imperative.

What is the plural form of auxiliary?

The plural form is "auxiliaries."

Which article is used with auxiliary?

Both "a" and "the" can be used with "auxiliary" based on context.

What is a stressed syllable in auxiliary?

The second syllable, "il," is stressed in "auxiliary."

Which preposition is used with auxiliary?

Common prepositions used with "auxiliary" include "to" and "of," depending on context.

What is the second form of auxiliary?

"Auxiliary" does not have verb forms.

How do we divide auxiliary into syllables?


What part of speech is auxiliary?

"Auxiliary" can be both a noun and an adjective.

What is another term for auxiliary?

Another term for "auxiliary" can be "supplementary."

What is the opposite of auxiliary?

The opposite of "auxiliary" could be "primary" or "main."

Which determiner is used with auxiliary?

Determiners like "this," "that," "the," and "an" can be used with "auxiliary."

What is the first form of auxiliary?

"Auxiliary" doesn't have verb forms, so there's no "first form."

How is auxiliary used in a sentence?

"The hospital has an auxiliary power system in case of blackouts."

Is auxiliary a vowel or consonant?

"Auxiliary" is a word and contains both vowels and consonants.

How many syllables are in auxiliary?

"Auxiliary" has four syllables.

What is the third form of auxiliary?

"Auxiliary" does not have verb forms.

Is auxiliary a countable noun?

Yes, "auxiliary" can be countable, as in "auxiliaries."

Is the auxiliary term a metaphor?

No, "auxiliary" is not inherently a metaphor, but it can be used metaphorically in some contexts.

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Author Spotlight

Written by
Fiza Rafique
Fiza Rafique is a skilled content writer at, where she meticulously refines and enhances written pieces. Drawing from her vast editorial expertise, Fiza ensures clarity, accuracy, and precision in every article. Passionate about language, she continually seeks to elevate the quality of content for readers worldwide.
Tayyaba Rehman is a distinguished writer, currently serving as a primary contributor to As a researcher in semantics and etymology, Tayyaba's passion for the complexity of languages and their distinctions has found a perfect home on the platform. Tayyaba delves into the intricacies of language, distinguishing between commonly confused words and phrases, thereby providing clarity for readers worldwide.

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