'obligatorily' definitions:

Definition of 'obligatorily'

(from WordNet)
adverb
In an obligatory manner; "this rule applies obligatorily" [ant: optionally]
adverb
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." [syn: compulsorily, obligatorily, mandatorily]