Etymology
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trainer (n.)

c. 1600, "one who educates or instructs," agent noun from train (v.). Meaning "one who prepares another for feats requiring physical fitness" is from 1823, originally of horse-trainers.

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Definitions of trainer

trainer (n.)
one who trains other persons or animals;
trainer (n.)
simulator consisting of a machine on the ground that simulates the conditions of flying a plane;
Synonyms: flight simulator
From wordnet.princeton.edu