obligatorily

adverb

oblig·​a·​to·​ri·​ly ə¦bligə¦tōrə̇lē 

¦äblə̇g-, 

-lēg-, 

-tȯr-, 

-li, 

chiefly British ¦äblə¦gāt(ə)rəli

: in an obligatory manner : so as to be obligatory

they are infinitesimally small, living things, obligatorily parasitic

—W. A. Hagan

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