Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective occurring every 1.5 years or 18 months.
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
Latin sesqui-, one and a half + annus, year
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Examples
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alexz commented on the word sesquiannual
You have to know what this word means to join linguistics club according to xkcd.
November 18, 2015