The Collaborative International Dictionary of English v.0.48:

Trainer \Train"er\, n.
   1. One who trains; an instructor; especially, one who trains
      or prepares men, horses, etc., for exercises requiring
      physical agility and strength.
      [1913 Webster]

   2. A militiaman when called out for exercise or discipline.
      [U. S.] --Bartlett.
      [1913 Webster]

WordNet (r) 3.0 (2006):

trainer
    n 1: one who trains other persons or animals
    2: simulator consisting of a machine on the ground that
       simulates the conditions of flying a plane [syn: flight
       simulator, trainer]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "trainer":
   Link trainer, athletic coach, breaker, breeder, broncobuster,
   buckaroo, cattleman, coach, cow keeper, cowman, crew trainer,
   dairy farmer, dairyman, driller, drillmaster, equerry, farrier,
   flight simulator, forerunner, grazier, groom, groomer, handler,
   horseshoer, hostler, instructor, intermediate trainer, mentor,
   pathfinder, preparationist, preparator, preparer, rancher,
   ranchero, ranchman, sheepman, stableboy, stableman, stock raiser,
   stockbreeder, stockkeeper, stockman, tamer, teacher, trailblazer



U.S. Gazetteer Places (2000):

Trainer, PA -- U.S. borough in Pennsylvania
   Population (2000):    1901
   Housing Units (2000): 797
   Land area (2000):     1.055329 sq. miles (2.733289 sq. km)
   Water area (2000):    0.281134 sq. miles (0.728133 sq. km)
   Total area (2000):    1.336463 sq. miles (3.461422 sq. km)
   FIPS code:            77288
   Located within:       Pennsylvania (PA), FIPS 42
   Location:             39.828612 N, 75.403599 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Trainer, PA
    Trainer