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Adverb: optionally  óp-shu-nu-lee
  1. In an optional manner
    "this rule is applied optionally"

Antonym: obligatorily

Nearest

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