optionally

optional

[op-shuh-nl]
adjective
1.
left to one's choice; not required or mandatory: Formal dress is optional.
2.
leaving something to choice.

Origin:
1755–65; option + -al1

optionality, noun
optionally, adverb
nonoptional, adjective
nonoptionally, adverb
unoptional, adjective
unoptionally, adverb


1. discretional, elective, voluntary.
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World English Dictionary
optional (ˈɒpʃənəl)
 
adj
possible but not compulsory; left to personal choice
 
'optionally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

optional
in reference to things which may be done or not done, 1792, from option.
Online Etymology Dictionary, © 2010 Douglas Harper
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