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Auxiliary vs. Auxillary — Which is Correct Spelling?

By Tayyaba Rehman & Fiza Rafique — Updated on March 20, 2024
The correct spelling is "Auxiliary," while the incorrect spelling is "Auxillary." "Auxiliary" refers to providing additional support or help.
Auxiliary vs. Auxillary — Which is Correct Spelling?

Which is correct: Auxiliary or Auxillary

How to spell Auxiliary?


Correct Spelling


Incorrect Spelling

Key Differences

Remember that "auxiliary" is like "extra," both words have only one 'l.'
"Auxiliary" can be broken down into "aux-ili-ary," where "ili" acts as a central piece to remember.
Think of "aux" as short for "auxiliary," helping you remember the first part.
Associate the word with "military," another word that ends with "-ary" and has one 'l.'
The correct spelling, "Auxiliary," has one 'l,' not two.

How Do You Spell Auxillary Correctly?

Incorrect: We need to activate the auxillary power supply during the outage.
Correct: We need to activate the auxiliary power supply during the outage.
Incorrect: The school's auxillary staff is planning a fundraising event.
Correct: The school's auxiliary staff is planning a fundraising event.
Incorrect: They decided to join the fire department's auxillary team.
Correct: They decided to join the fire department's auxiliary team.
Incorrect: The hospital is opening a new auxillary wing next month.
Correct: The hospital is opening a new auxiliary wing next month.
Incorrect: He was promoted to an auxillary position in the military.
Correct: He was promoted to an auxiliary position in the military.

Auxiliary Definitions

Auxiliary refers to a person or thing providing additional support.
She served in an auxiliary capacity at the hospital.
As an adjective, auxiliary describes anything supplementary or additional.
We have an auxiliary power source.
In grammar, an auxiliary is a helping verb.
In the sentence She is running, is is an auxiliary verb.
In technology, auxiliary can mean secondary or backup systems.
The computer has an auxiliary cooling system.
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
In naval terms, auxiliary refers to backup ships not used for combat.
The fleet was accompanied by auxiliary vessels.

Auxiliary Meaning in a Sentence

The auxiliary gym is open for students after school.
The library relies on auxiliary volunteers to help during the book sale.
Our team has an auxiliary coach who helps out when needed.
In the navy, he served on an auxiliary ship that supported the fleet.
She works as an auxiliary nurse at the local hospital on weekends.
To improve the concert sound, they added auxiliary speakers around the hall.
During the storm, the auxiliary generators kept the lights on.
The emergency services activated their auxiliary units during the disaster.
I'm part of the auxiliary committee that organizes the school dances.
The building's auxiliary entrance is used during emergencies.
The auxiliary police officers were called to help manage the crowd.
The company's auxiliary warehouse stores overflow stock during the holiday season.
They set up auxiliary tents to accommodate all the campers.
The team has auxiliary players who can fill in for injured teammates.
The flight was delayed, so the airline called in an auxiliary crew.
The car's auxiliary port allows you to connect your phone to the stereo system.
In severe weather, the city uses auxiliary pumps to prevent flooding.
The science fair included an auxiliary exhibit of student inventions.
Our school's band was joined by auxiliary percussionists for the concert.
After the main system failed, they switched to an auxiliary cooling system.
Our auxiliary plan ensures we can continue operations during a power outage.
The software includes an auxiliary tool for data analysis.
The event will have an auxiliary registration desk in case the main one gets too crowded.
He's learning to pilot with the help of an auxiliary engine in his glider.
The museum's auxiliary fund supports special exhibitions.

Auxiliary Idioms & Phrases

An auxiliary arm

Referring to a supportive or supplementary role or organization.
The volunteer group acted as an auxiliary arm of the disaster relief effort, providing essential supplies to affected areas.

To call in the auxiliary

To request additional support or resources in a situation.
With the influx of patients, the hospital had to call in the auxiliary medical staff.

Auxiliary forces at work

Additional support or efforts are contributing to a task or goal.
With the auxiliary forces at work, the community quickly rebuilt the playground.

Auxiliary to the rescue

When additional help or support arrives just in time.
When the main power went out, the backup generators were auxiliary to the rescue, keeping the lights on.

Common Curiosities

What is the verb form of Auxiliary?

There's no standard verb form; it is generally an adjective or a noun.

What is the pronunciation of Auxiliary?

/ɔɡˈzɪl yəˌrɛr i/

Which vowel is used before Auxiliary?

"An," as in "an auxiliary."

Why is it called Auxiliary?

Because it refers to something that is supplementary or additional.

What is the singular form of Auxiliary?


What is the root word of Auxiliary?

From Latin "auxilium," meaning help.

What is the plural form of Auxiliary?


Which preposition is used with Auxiliary?

"To," as in "auxiliary to."

Which article is used with Auxiliary?

"An" or "the."

Which conjunction is used with Auxiliary?

"And," as in "auxiliary and supplementary."

Is Auxiliary an adverb?


Is Auxiliary a noun or adjective?

Both, depending on context.

Is the word Auxiliary imperative?


Is Auxiliary a vowel or consonant?

It is a word, not a vowel or consonant.

Is the word “Auxiliary” a Direct object or an Indirect object?

It can be a direct object when used as a noun.

How many syllables are in Auxiliary?

Four syllables.

Is Auxiliary a collective noun?


Is the word Auxiliary a gerund?


How do we divide Auxiliary into syllables?


What is a stressed syllable in Auxiliary?

The second syllable, "il."

What part of speech is Auxiliary?

Noun or Adjective.

What is another term for Auxiliary?


What is the opposite of Auxiliary?

Main or primary.

How is Auxiliary used in a sentence?

"The school has an auxiliary gym for additional activities."

Is Auxiliary an abstract noun?


Is the Auxiliary term a metaphor?

It can be used metaphorically.

Is Auxiliary a negative or positive word?


Is Auxiliary a countable noun?

Yes, in its noun form.

Which determiner is used with Auxiliary?

"The" or "an."

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Author Spotlight

Written by
Tayyaba Rehman
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.
Co-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.

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