a measuring instrument or device for keeping time

measure the time or duration of an event or action or the person who performs an action in a certain period of time

set the speed, duration, or execution of

an accurate timer for recording time

a coin-operated timer located next to a parking space; depositing money into it entitles you to park your car there for a specified length of time

a timepiece that can be started or stopped for exact timing (as of a race)