noun a promise or pledge; a guarantee.
2. undertaking ·p.pr. & ·vb.n. of undertake.
3. undertaking ·noun the act of one who undertakes, or engages in, any project or business.
4. undertaking ·noun specifically, the business of an undertaker, or the management of funerals.
5. undertaking ·noun that which is undertaken; any business, work, or project which a person engages in, or attempts to perform; an enterprise.