Real Dictionary

work
People who have work or who are in work have a job, usually one which they are paid to do.
Work is the place where you do your job.
countable noun: A work is something such as a painting, book, or piece of music produced by an artist, writer, or composer.
uncountable noun: Work is something which you produce as a result of an activity or as a result of doing your job.
uncountable noun: Your work consists of the things you are paid or required to do in your job.
verb: If someone is working on a particular subject or question, they are studying or researching it.
verb: If you work with a person or a group of people, you spend time and effort trying to help them in some way.
verb: People who work have a job, usually one which they are paid to do.
verb: When you work, you do the things that you are paid or required to do in your job.
verb: When you work, you spend time and effort doing a task that needs to be done or trying to achieve something.

work in American English
physical or mental effort exerted to do or make something; purposeful activity; labor; toil

work in American Englisharchaic except for 35, 37, 40
noun: exertion or effort directed to produce or accomplish something; labor; toil

work in Mechanical Engineering
noun: Work is a type of energy associated with a force acting on a large object in order to accelerate it.