Source : WordNet®

taken for granted
     adj 1: evident without proof or argument; "an axiomatic truth"; "we
            hold these truths to be self-evident" [syn: {axiomatic},
             {self-evident}, {taken for granted(p)}]
     2: accepted as real or true without proof; "an assumed increase
        in population"; "the assumed reason for his absence";
        "assumptive beliefs"; "his loyalty was taken for granted"
        [syn: {assumed}, {assumptive}, {taken for granted(p)}]