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equivalent (adj.)

early 15c., "equal in value, power, or effect," from Late Latin aequivalentem (nominative aequivalens) "equivalent," present participle of aequivalere "be equivalent," from Latin aequus "equal" (see equal (adj.)) + valere "be well, be worth" (from PIE root *wal- "to be strong"). As a noun from c. 1500, "that which is equal or corresponds to." Related: Equivalently.

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Definitions of equivalent from WordNet
1
equivalent (n.)
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
equivalent (n.)
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;
Synonyms: equivalent weight / combining weight / eq
2
equivalent (adj.)
being essentially equal to something;
a wish that was equivalent to a command
Synonyms: tantamount
From wordnet.princeton.edu