Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun prerequisite

1 sense of prerequisite

Sense 1
prerequisite, requirement -- (something that is required in advance; "Latin was a prerequisite for admission")
       => duty, responsibility, obligation -- (the social force that binds you to the courses of action demanded by that force; "we must instill a sense of duty in our children"; "every right implies a responsibility; every opportunity, an obligation; every possession, a duty"- John D.Rockefeller Jr)

Antonyms of adj prerequisite

1 sense of prerequisite

Sense 1
prerequisite -- (required as a prior condition or course of study)

INDIRECT (VIA obligatory) -> optional -- (possible but not necessary; left to personal choice)

Similarity of adj prerequisite

1 sense of prerequisite

Sense 1
prerequisite -- (required as a prior condition or course of study)
       => obligatory (vs. optional) -- (morally or legally constraining or binding; "attendance is obligatory"; "an obligatory contribution")