Antonyms of adj semestral

1 sense of semestral

Sense 1
semestral, semestrial -- (occurring every six months or during every period of six months)

INDIRECT (VIA periodic) -> aperiodic, nonperiodic -- (not recurring at regular intervals)

Similarity of adj semestral

1 sense of semestral

Sense 1
semestral, semestrial -- (occurring every six months or during every period of six months)
       => periodic (vs. aperiodic), periodical -- (happening or recurring at regular intervals; "the periodic appearance of the seventeen-year locust")

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