Definitions for tangentialtænˈdʒɛn ʃəl
Random House Webster's College Dictionary
tan•gen•tialtænˈdʒɛn ʃəl(adj.)
pertaining to or of the nature of a tangent; being or moving in the direction of a tangent.
incidental; peripheral.
divergent or digressive:
tangential remarks.
Origin of tangential:
1620–30
tan•gen′tial•ly(adv.)
Princeton's WordNet
digressive, tangential(adj)
of superficial relevance if any
"a digressive allusion to the day of the week"; "a tangential remark"
tangential(adj)
of or relating to or acting along or in the direction of a tangent
"tangential forces"
Wiktionary
tangential(Adjective)
Referring to a tangent, moving at a tangent to something.
tangential(Adjective)
Merely touching, positioned as a tangent.
tangential(Adjective)
Only indirectly related.
That subject is tangential to our discussion, we can't let it distract us.
Webster Dictionary
Tangential(adj)
of or pertaining to a tangent; in the direction of a tangent
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"tangential." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/tangential>.

