phase

[1]	phase in , (gradually) introduce , usher in , work in , inject , insert , insinuate , include , incorporate
[2]	phase out , ease out/off , taper off , wind up , put a stop to , (gradually) eliminate , remove , withdraw , discontinue , end

[1]	stage , stage , period , development , step
[2]	time , form , moment , juncture , occasion
[3]	state , phase angle , form , shape , configuration , aspect , appearance , look , condition , status
[4]	facet , side , angle , viewpoint , point of view , (Colloq) slant