|adv.||1.||In an obligatory manner; by reason of obligation.|
|Adv.||1.||obligatorily - in an obligatory manner; "this rule applies obligatorily"|
optionally - in an optional manner; "this rule is applied optionally"
|2.||obligatorily - in a manner that cannot be evaded; "the ministry considers that contributions to such a fund should be met from voluntary donations rather than from rates compulsorily levied."|