- optional op‧tion‧al [ˈɒpʆnəl ǁ ˈɑːp-] adjectiveif something is optional, you can choose whether or not you have it, do it, or use it:
• You can have a 17-inch monitor as an optional extra (= something that is additional to or better than the basic type ) .
• The use of a password to access the system is optional.— compare standard2
* * *optional UK US /ˈɒpʃənəl/ adjective► COMMERCE something that is optional is something that you can buy or do if you want to, but that you do not have to buy or do: »
Optional plug-ins cost a further $50 on average.»
optional accessories/components● optional extra — Cf. optional extra
Financial and business terms. 2012.