Antonyms of adj biyearly

2 senses of biyearly

Sense 1
biennial, biyearly -- (occurring every second year; "they met at biennial conventions")

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

Sense 2
semiannual, biannual, biyearly, half-yearly -- (occurring or payable twice each year)

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

Similarity of adj biyearly

2 senses of biyearly

Sense 1
biennial, biyearly -- (occurring every second year; "they met at biennial conventions")
       => periodic (vs. aperiodic), periodical -- (happening or recurring at regular intervals; "the periodic appearance of the seventeen-year locust")

Sense 2
semiannual, biannual, biyearly, half-yearly -- (occurring or payable twice each year)
       => periodic (vs. aperiodic), periodical -- (happening or recurring at regular intervals; "the periodic appearance of the seventeen-year locust")

Synonyms of adv biyearly

2 senses of biyearly

Sense 1
biennially, biyearly -- (every two years; "this festival takes places biennially")

Sense 2
semiannually, biyearly -- (twice a year)