undertaking

Definitions:

Engaging in; beginning to perform.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (verb) (v. impers.) (verb, impersonal)
Any business or project which a person engages to perform; an enterprise.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (noun) (n.) (noun)
Any business or project which a person undertakes; an enterprise.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (noun) (n.) (noun)
That which is undertaken: any business or project engaged in.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (noun) (n.) (noun)
Enterprise; business; project.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (noun) (n.) (noun)
of Undertake
- Newage Dictionary DB (imperfect) (imp.) (imperfect)
The taking upon oneself of a taks or responsibility; especially, the business of managing funerals; an enterprise.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)

Usage examples:

But I feel very sore about your giving up the new undertaking
- Ranching for Sylvia by Harold Bindloss
This would not be a very easy undertaking unless he was less watchful than is usually the case with his people.
- With Axe and Rifle by W.H.G. Kingston
It was too great an undertaking to explain all those daily experiences of longing and disappointment to her mother.
- Jewel's Story Book by Clara Louise Burnham