Noun

• S: (n) equivalent (a person or thing equal to another in value or measure or force or effect or significance etc) "send two dollars or the equivalent in stamps"
• S: (n) equivalent, equivalent weight, combining weight, eq (the atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen)

Adjective

• S: (adj) equivalent, tantamount (being essentially equal to something) "it was as good as gold"; "a wish that was equivalent to a command"; "his statement was tantamount to an admission of guilt"
• similar to
• derivationally related form
• antonym