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What do a.m. and p.m. stand for?

optional

[op-shuh-nl] /ˈɒp ʃə nl/
adjective
1.
left to one's choice; not required or mandatory:
Formal dress is optional.
2.
leaving something to choice.
Origin of optional
1755-1765
1755-65; option + -al1
Related forms
optionality, noun
optionally, adverb
nonoptional, adjective
nonoptionally, adverb
unoptional, adjective
unoptionally, adverb
Synonyms
1. discretional, elective, voluntary.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for optional

optional

/ˈɒpʃənəl/
adjective
1.
possible but not compulsory; left to personal choice
Derived Forms
optionally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for optional
adj.

1765, from option + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper
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