optional

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(Adjective) you may choose

Usage: Providing telephone details was optional.

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(Adjective) Not needing to, the choice for you to make; Not mandatory.

Usage: Providing your address is optional, but you must include your name and phone number.

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(Adjective) this is not an obligation, you can do it, it's possible, but you are still allowed not to do it

Usage: latin lessons are optional

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(Adjective) not necessary.