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Adjective: optional  óp-sh(u)-n(u)l
  1. Possible but not necessary; left to personal choice
    "Optional exercises allow faster students to explore further"

See also: elective, ex gratia, facultative, nonmandatory, nonobligatory, optionally

Antonym: obligatory

Nearest

optimisation
optimise
optimism
optimist
optimistic
optimistically
optimization
optimize
optimum
option
optional
optionally
optometrist
optometry
opulence
opulent
opulently
Opuntia
Opuntia cholla
Opuntia lindheimeri
Opuntia tuna