Synonymy (equivalence relation)

Synonymy is a kind of semantic relation. Two words (or phrases) are synonyms when they have the same meaning. (Terms with subtle differences between meanings are termed near-synonyms).
Example. The WordNet database differentiates two meanings of the word “computer”. The first meaning is “a machine for performing calculations automatically”. For this meaning is on January 2004 listed the following six synonyms:
 computer,
 computing machine,
 computing device,
 data processor,