WordWeb Online

1. Marked by correspondence or resemblance
   "problems similar to mine"; "they wore similar coats"; "similar food at similar prices"
    
2. Having the same or nearly the same characteristics
   "all politicians are similar";
   - alike, like
    
3. (of words) expressing closely related meanings
    
4. Capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability
   "similar electric outlets";
   - exchangeable, interchangeable, standardized, standardised [Brit]
    
5. Resembling; having the same or some of the same characteristics; often used in combination
   "suits of similar design";
   - like

See also: akin, alikeness [rare], analogous, confusable, connatural, correspondent, corresponding, kindred, like-minded, likeness, look-alike, mistakable, mistakeable, quasi, replaceable, same, similarity, similitude, suchlike, sympathetic, synonymous

Antonym: dissimilar, unlike

Encyclopedia: Similar