Definify.com
Webster 1913 Edition
Entrain
En-train′
,Verb.
 T.
 [F. 
entrainer
.] To draw along as a current does; 
 as, water 
. entrained 
by steamEn-train′
,Verb.
 T.
 [Pref. 
en- 
+ train
.] To put aboard a railway train; 
as, to 
. entrain 
a regiment[Recent, Eng.] 
 En-train′
,Verb.
 I.
 To go aboard a railway train; 
as, the troops 
. entrained 
at the station[Recent, Eng.] 
Definition 2025
entrain
entrain
English
Verb
entrain (third-person singular simple present entrains, present participle entraining, simple past and past participle entrained)
-  To draw along as a current does.
- water entrained by steam
 
- (chemistry) To suspend small particles in the current of a fluid.
- (mathematics) To set up or propagate a signal, such as an oscillation.
- (figuratively) To encarriage, to conjoin, to link; as in a series of entities, elements, objects or processes.
Etymology 2
Verb
entrain (third-person singular simple present entrains, present participle entraining, simple past and past participle entrained)
- (poetic, intransitive) To get into or board a railway train.
-  (transitive) To put aboard a railway train.
- to entrain a regiment