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semi-revolution
semi-revolution n. 
/ˈsɛmiˌrɛvəˌluʃ(ə)n/
Brit. /ˈsɛmɪrɛvəˌl(j)uːʃn/
, /ˈsɛmɪrɛvəˌl(j)uːʃn/U.S. /ˈsɛˌmaɪˌrɛvəˌluʃ(ə)n/
, /ˈsɛˌmaɪˌrɛvəˌluʃ(ə)n//ˈsɛmiˌrɛvəˌluʃ(ə)n/ΚΠ
1715 tr. D. Gregory Elements Astron. I. ii. §64. 131 A Semi-revolution of the Earth about the Sun.
1884 F. Krohn tr. G. Glaser de Cew Magneto- & Dynamo-electr. Machines 242 The current changes its direction with every semi-revolution of the spindle.
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