Optional vs. Obligatory

Difference Between Optional and Obligatory
Optional➦
Left to choice; not compulsory or automatic.
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Obligatory➦
required by a legal, moral, or other rule; compulsory
use of seat belts in cars is now obligatory
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Optional➦
Not compulsory; left to personal choice; elective.
On that beach clothing is entirely optional.
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Obligatory➦
Of the nature of an obligation; compulsory
Attendance is obligatory. Mathematics is an obligatory course.
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Optional➦
Something that is not compulsory, especially part of an academic course.
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Obligatory➦
Required as part of a routine course of action or cultural expectation; predictable
"wearing clothing like basketball shoes, baggy pants, and the obligatory baseball cap" (Tyler Stovall).
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Optional➦
In various programming languages, a kind of variable that is assigned a specific data type but may or may not hold an actual value.
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Obligatory➦
(Biology) Obligate.
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Optional➦
Involving an option; depending on the exercise of an option; left to one's discretion or choice; allowed but not compulsory; as, optional studies; it is optional with you to go or stay.
If to the former the movement was not optional, it was the same that the latter chose when it was optional.
Original writs are either optional or peremptory.
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Obligatory➦
Imposing obligation, legally, morally, or otherwise; binding; mandatory.
an obligatory promise
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Optional➦
possible but not necessary; left to personal choice
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Obligatory➦
Requiring a matter or obligation.
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Obligatory➦
Binding in law or conscience; imposing duty or obligation; requiring performance or forbearance of some act; - often followed by on or upon; as, obedience is obligatory on a soldier.
As long as the law is obligatory, so long our obedience is due.
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Obligatory➦
morally or legally constraining or binding;
attendance is obligatory
an obligatory contribution
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Obligatory➦
required by obligation or compulsion or convention;
he made all the obligatory apologies
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