This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To pull or draw along after itself.

v. Chemistry To carry (suspended particles, for example) along in a current.

verb-intransitive. To go aboard a train.

v. To put aboard a train.

v. To get into or board a train.

v. To suspend small particles in the current of a fluid.

v. To encarriage, to conjoin, to link; as in a series of entities, elements, objects or processes.

v. To draw along as a current does.

v. To put aboard a railway train.

verb-intransitive. To go aboard a railway train.

To draw on.

To carry along mechanically by the flow of another fluid at high velocity.

To put aboard a train.

To go aboard a train.

v. board a train

"And sarcasms, sallies, jests, that French thing which is called entrain, and that English thing which is called humor, good and bad taste, good and bad reasons, all the wild pyrotechnics of dialogue, mounting together and crossing from all points of the room, produced a sort of merry bombardment over their heads."

detrain   

entrained    entraining    entrains   

board    get on   

board   

momentousness    vanguard    idea    good-heartedness    elect    proclaimer    coincidence