Main Entry: ¹en·train

Pronunciation: \in-ˈtrān\

Function: transitive verb

Etymology: Middle French entrainer, from en- + trainer to draw, drag — more at train

Date: 1568

1 : to draw along with or after oneself
2 : to draw in and transport (as solid particles or gas) by the flow of a fluid
3 : to incorporate (air bubbles) into concrete
4 : to determine or modify the phase or period of <circadian rhythms entrained by a light cycle>

— en·train·er noun

— en·train·ment \-ˈtrān-mənt\ noun