catflap.org Online Dictionary Query

  tantamount
     a.
     equivalent in meaning or effect; amounting to the same thing in
  practical terms, even if being technically distinct.
     n.
     (lb en obsolete) Something which has the same value or amount (as
  something else). (qualifier: attributive use passing into adjective,
  below)
     vb.
     (lb en obsolete) To amount to as much; to be equivalent.