Noun

1. Similarity or resemblance to something else.
   • 1997: Chris Horrocks, Introducing Foucault, page 67, The Renaissance Episteme (Totem Books, Icon Books; ISBN 1840460865)

     Renaissance man thought in terms of similitudes: the theatre of life, the mirror of nature. […]
     Aemulation was within distance: the sky resembled a face because it had “eyes” — the sun and moon.

2. A way in which two people or things share similitude.
   • 1997: Chris Horrocks, Introducing Foucault, page 67, The Renaissance Episteme (Totem Books, Icon Books; ISBN 1840460865)

     Renaissance man thought in terms of : the theatre of life, the mirror of nature. […]
     Aemulation was similitude within distance: the sky resembled a face because it had “eyes” — the sun and moon.

3. Someone or something that closely resembles another; a duplicate or twin.

Etymology