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Douglas Harper's Etymology Dictionary
semi-annual

also semiannual, 1775, from semi- + annual. Related: Semiannually.

Wiktionary
semi-annual

a. (alternative spelling of semiannual English)

Usage examples of "semi-annual".

Like poor Celia Greenway would never again know the joy of a semi-annual clearance sale at Bloomies, the scent of new leather pumps, or the thrill of finding that one-of-a-kind bag in the half-off bin.

One night Cal ran into Rabbit Holman, who was up from San Ardo on his semi-annual drunk.