1.Definition: (of words) expressing closely related meanings

2.Definition: capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability

Related Adjective(s):exchangeable, interchangeable, standardised, standardized

3.Definition: having the same or similar characteristics

Related Adjective(s):alike, like

4.Definition: marked by correspondence or resemblance

"Similar food at similar prices", "Problems similar to mine", "They wore similar coats"

5.Definition: resembling or similar; having the same or some of the same characteristics; often used in combination

Related Adjective(s):like