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semi-amplitude
semi-amplitude n. 
/ˈsɛmɪˌamplᵻtʃuːd/, /ˈsɛmiˌæmpləˌt(j)ud/
Brit. /ˈsɛmɪˌamplᵻtjuːd/
, /ˈsɛmɪˌamplᵻtjuːd//ˈsɛmɪˌamplᵻtʃuːd/U.S. /ˈsɛˌmaɪˌæmpləˌt(j)ud/
, /ˈsɛˌmaɪˌæmpləˌt(j)ud//ˈsɛmiˌæmpləˌt(j)ud/ΚΠ
1831 D. Brewster Treat. Optics x. 94 By exposing the north pole of a needle a foot long, the semi-amplitude of the last oscillation was 6° more than the first.
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