activity directed toward making or doing something

code name for the secret United States project set up in 1942 to develop atomic bombs for use in World War II

assign a task to

any undertaking that is easy to do

a wild and exciting undertaking (not necessarily lawful)

an undertaking that you have been assigned to do (as by an instructor)

a project of personal concern to someone

a purposeful or industrious undertaking (especially one that requires effort or boldness)

code name for the secret United States project set up in 1942 to develop atomic bombs for use in World War II