1. people who observe and identify aircraft, trains, or other vehicles as a hobby
2. people who assist weightlifters by standing ready to help if needed
Usage: fitness
3. people who detect or identify something, especially problems or talent

Examples

• The plane spotters gathered at the airport with their cameras.
• Train spotters recorded the numbers of every locomotive they saw.
• He always asks for spotters when lifting heavy weights at the gym.
• The talent spotters were impressed by her performance.
• Military spotters radioed the enemy’s location to headquarters.
• Bird spotters use binoculars to identify different species.
• The spotters helped him complete his final bench press rep safely.