An endeavor.
The work involved in performing an activity; exertion.
A force acting on a body in the direction of its motion.
To make an effort.
The act of one who undertakes (in either sense).
A promise or pledge; a guarantee.
That which is undertaken; any business, work, or project which a person engages in, or attempts to perform; an enterprise.
The business of an undertaker, or the management of funerals.