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semi-active
semi-active adj. 
/ˌsɛmiˈæktɪv/ designating a method of missile guidance in which the missile responds to a signal transmitted from elsewhere and reflected by the target.
Brit. /ˌsɛmɪˈaktɪv/
, /ˌsɛmɪˈaktɪv/U.S. /ˌsɛˌmaɪˈæktɪv/
, /ˌsɛˌmaɪˈæktɪv//ˌsɛmiˈæktɪv/ΚΠ
1954 K. W. Gatland Devel. Guided Missile (ed. 2) iii. 83 Final guidance is obtained by the technique known as ‘semi-active homing’, the missile responding to target reflection from the ground radar.
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