1. Activity involving mental or physical effort done in order to achieve a result.
2. A task or tasks to be undertaken.
3. Be engaged in physical or mental activity in order to achieve a result; do work.
4. (Of a machine or system) function, especially properly or effectively.
Plural noun: Works.
Verb forms: Work, Worked, Worked.
Harjeev was tired after a day's work in the fields.