Tantamount
Part of speech: verb
Definition: To amount to as much; to be equivalent.
Part of speech: noun
Definition: Something which has the same value or amount (as something else).
Part of speech: adjective
Definition: Equivalent in meaning or effect.
Equivalent
Part of speech: noun
Definition: anything that is virtually equal to anotheran equivalent weight
Part of speech: adjective
Definition: similar or identical in value, meaning or effect; virtually equalof two sets, having a one-to-one relationshiprelating to the corresponding elements of an equivalence relationhaving the equal ability to combineof a map, equal-area
Example sentence: It is a curious historical fact that modern quantum mechanics began with two quite different mathematical formulations: the differential equation of Schroedinger and the matrix algebra of Heisenberg. The two apparently dissimilar approaches were proved to be mathematically equivalent.