Webster's Revised Unabridged Dictionary · 1913

Entrain

Entrain , transitive verb

[French entrainer.]

To draw along as a current does; as, water entrained by steam.

Entrain , transitive verb

[Prefix en- + train.]

To put aboard a railway train; as, to entrain a regiment. [Recent, English]

Entrain , intransitive verb

To go aboard a railway train; as, the troops entrained at the station. [Recent, English]