Entry 3 senses · 3 variants Webster, 1913 Entrain · En·train · IPA v. t. v. t. v. i. 01 v. t. To draw along as a current does; as, water entrained by steam. 1. To draw along as a current does; as, water entrained by steam. 02 v. t. To put aboard a railway train; as, to entrain a regiment. 1. To put aboard a railway train; as, to entrain a regiment.[Recent, Eng.] 03 v. i. To go aboard a railway train; as, the troops entrained at the station. 1. To go aboard a railway train; as, the troops entrained at the station.[Recent, Eng.]