Hypertext Webster Gateway: "optionally"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Optionally \Op"tion*al*ly\, adv.
In an optional manner.
From WordNet (r) 1.7 (wn)
optionally
adv : in an optional manner; "this rule is applied optionally"
[ant: {obligatorily}]
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