The Collaborative International Dictionary of English v.0.48:

Going \Go"ing\, p. pr. of Go. Specif.:
      (a) That goes; in existence; available for present use or
          enjoyment; current; obtainable; also, moving; working;
          in operation; departing; as, he is of the brightest
          men going; going prices or rate.
      (b) Carrying on its ordinary business; conducting
          business, or carried on, with an indefinite prospect
          of continuance; -- chiefly used in the phrases

   a going business,

   concern, etc.
      (c) Of or pertaining to a going business or concern; as,
          the going value of a company.
          [Webster 1913 Suppl.] Goiter