Definitions:

1. coming from the outside adjective
   • extraneous light in the camera spoiled the photograph
2. not essential adjective
   • the ballet struck me as extraneous and somewhat out of keeping with the rest of the play
3. not pertinent to the matter under consideration adjective
   • an issue extraneous to the debate

Synonyms:

• foreign
• impertinent
• outside

NearBy Words:

• extraneousness