be·liev·able
bə-ˈlē-və-bəl
: capable of being believed especially as within the range of known possibility or probability
be·liev·abil·i·ty
bə-ˌlē-və-ˈbi-lə-tē
bē-
plural -es
: the quality or state of being believable
advertising exists basically on a foundation of believability—
C. B. Larrabee
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Merriam-Webster unabridged



