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phase line ['feɪzlaɪn]
mil., logist.	A line used for control and coordination of military operations. It is usually along recognizable terrain feature extending across the sector or zone of action. Units normally report crossing PLs, but do not halt unless specifically directed. (FRA); A line utilized for control and coordination of military operations, usually a terrain feature extending across the zone of action. (FRA)
USA	A line utilized for control and coordination of military operations, usually an easily identified feature in the operational area (JP 3-09)

phase: 10 phrases in 6 subjects

Abbreviation	5
Computers	1
Ecology	1
Electronics	1
NASA	1
Physics	1