"obligatorily" in the adverb sense
1. obligatorily
in an obligatory manner
"this rule applies obligatorily"
2. compulsorily, obligatorily, mandatorily
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."
Source: WordNet® (An amazing lexical database of English)
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