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необязательный adj. stresses
gen.	adventice; facultatif; optional (rejoice-ngg)
comp.	aux choix; au choix
IT	optionnel
patents.	facultatif (напр. и признаке изобретения)
необязательно adv.
inf.	pas forcément (bienheureuse)
patents.	éventuellement (kirei)

необязательно: 29 phrases in 14 subjects

Accounting	1
Alternative dispute resolution	1
Automated equipment	1
Business	1
Commerce	2
European Union	2
Food service and catering	1
Forestry	1
Information technology	8
Law	1
Mathematics	1
Microsoft	3
Patents	3
Programming	3