For something to be optional, it means the availability of
choice/choices, to have alternatives. The opposite of optional is
mandatory, compulsory, required.
Do you think someone who skipped grade school could jump right
into highschool? NO not at all. If grade school were optional then
high school would have to be optional.. and of course college is
already optional.
There is the base 230hp 283ci V8, the optional 245hp 283ci V8,
the optional 250hp 283ci fuel-injected V8, the optional 270hp 283ci
V8, and the optional 290hp 283ci fuel-injected V8.
Something that can be chosen but is not required. For instance,
you can have a hamburger, but do not need to have pickles on it,
they would be optional.
Depends on the type of bike. On most bikes things like locks,
fenders, racks and chainguards/chaincases are optional. Lights and
reflectors can also be optional.
The cast of Brink - 2011 includes: Jimmy Akingbola as Various
optional characters Nonso Anozie as Captain Clinton Mokoena Richie
Campbell as Various optional characters Junix Inocian as Brother
Joseph Chen Niki Kernow as Voice of Ark Ryan McCluskey as Various
optional characters Alec Newman as Various optional characters Ray
Shell as Various optional characters David Yip as Various optional
characters
The authors of some textbooks label certain exercises optional
to imply that they don't have to be completed, but serve to give
students and readers extra practice should they want it.
Of course, whether they are optional or not depends on certain
factors. If you are doing them by your own choice, then they're
optional (i.e. you can choose not to do them). If a teacher tells
you to finish them as homework, then the exercises lose that
"optional" factor.