"trueness" in the noun sense
1. truth, the true, verity, trueness
conformity to reality or actuality
"they debated the truth of the proposition"
"the situation brought home to us the blunt truth of the military threat"
"he was famous for the truth of his portraits"
"he turned to religion in his search for eternal verities"
2. loyalty, trueness
the quality of being loyal
exactness of adjustment
"I marveled at the trueness of his aim"
Source: WordNet® (An amazing lexical database of English)
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