trainer-n; 4 Senses

Sense Number 1: a person who instructs, coaches others

Commentary: TRAINER[+entity][+person][+instructor]

Examples:
They took a picture of the championship horse with his jockey and his trainer.
Mary hired a personal trainer at the gym to work with her three days a week.
John is attending a week-long conference to become a trainer for the sales force.

Mappings:
WordNet 3.0 Sense Numbers: 1

Sense Number 2: a simulator, machine that instructs or teaches a skill

Commentary: TRAINER[+entity][+artifact][+machine][+simulator][+instructional]

Examples:
The airline charges $1500/hour for use of it's flight trainers.
The astronauts practiced hundreds of hours in their trainers before the actual mission.

Mappings:
WordNet 3.0 Sense Numbers: 2

Sense Number 3: person that treats sports teams for minor injuries

Commentary: TRAINER[+entity][+person][+assistant][+medical][+sports_team]

Examples:
The trainer looked at the player's hand after it was struck by the baseball.
The trainer told the basketball coach that the star player needed to rest his ankle.

Mappings:
WordNet 0.0 Sense Numbers: 3

Sense Number 4: sneaker, athletic shoe

Commentary: TRAINER[+entity][+artifact][+apparel][+shoe][+sneaker]
NOTE: chiefly British usage.

Examples:
I bought some new trainers for the marathon.
These trainers are good for walking, but not really suitable for running.

Mappings:
WordNet 0.0 Sense Numbers: 4