Čo znamená optional v angličtine a aká je definícia optional?

V tomto najautoritatívnejšom anglickom slovníku sa môžete naučiť optional výslovnosť, gramatika a synonymá.

optional Význam & definícia

0 If something is optional, you can choose if you want to do it, pay it, buy it, etc.:
- English is compulsory for all students, but art and music are optional.
1 not necessary or demanded but possible or available; depending on what you decide to do:
- I think military service should be completely optional.
2 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
3 something that can be added, at extra cost, to a basic product or service to make it more attractive, efficient, etc.:
- Some car manufacturers offer advanced stereo systems as an optional extra on their more expensive models.

Seat-belts are included as standard but electric windows are an optional extra.
My phone came with 20 optional ringtones.
Do come to the party - fancy dress is optional.
There are several optional tours, for which there will be a small charge.
The basic model is quite cheap, but there are a lot of optional extras.
We show how to extend any existing parser combinator library with support for parsing permutations of typed, potentially optional elements.
The final (optional) element of the sequence gives the values of the syntactic functions, adjuncts and specifiers (in any order, distinguished by their role names).
Take is usually a transitive verb, yet although it has an obligatory direct-object argument, locative arguments are normally optional.