p. pr. & vb. n. - of Begin
n. - The act of doing that which begins anything; commencement of an action, state, or space of time; entrance into being or upon a course; the first act, effort, or state of a succession of acts or states.
n. - That which begins or originates something; the first cause; origin; source.
n. - That which is begun; a rudiment or element.
n. - Enterprise.