Etymograph

English

semimonthly

From semi- + monthly.

A compound of semi- + monthly

Proto-Indo-European *sem- ‘one’

Proto-Indo-European *sēmi ‘half’

English semi-

Middle English *monethly ‘monthly’

English monthly

Today it means

adj Occurring twice a month or at half month intervals.

Sources

Sources: Wiktionary, “semimonthly”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.

Etymograph / semimonthly