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semi-mensual
semi-mensual adj. 
/ˌsɛmɪˈmɛnsjᵿl/, /ˌsɛmɪˈmɛnʃʊəl/, /ˌsɛmɪˈmɛnʃ(ᵿ)l/, /ˌsɛmiˈmɛn(t)ʃ(əw)əl/ recurring twice a month; of tides (see quot. 1863 for semi-menstrual adj.).
Brit. /ˌsɛmɪˈmɛnsjʊəl/
, /ˌsɛmɪˈmɛnsjʊəl//ˌsɛmɪˈmɛnsjᵿl//ˌsɛmɪˈmɛnʃʊəl//ˌsɛmɪˈmɛnʃ(ᵿ)l/U.S. /ˌsɛˌmaɪˈmɛn(t)ʃ(əw)əl/
, /ˌsɛˌmaɪˈmɛn(t)ʃ(əw)əl//ˌsɛmiˈmɛn(t)ʃ(əw)əl/ΚΠ
1847 W. Whewell Hist. Inductive Sci. (rev. ed.) II. 311 The laws of a great number of the tidal phenomena, namely, of the Semi-mensual Inequality of the Heights.
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