(n.) The act of checking truth or accuracy; confirmation\.

acid test affirmation ascertainment assay assurance attestation authentication backing backing up bearing out blank determination bolstering brouillon buttressing certification check checking circumstantiation collation comparative scrutiny confirmation corroboration corroboratory evidence criterion cross-check crucial test crucible determination docimasy documentation ensuring essay establishment feeling out first draft fortification kiteflying ordeal probation proof proving proving out ratification reassurance reassurement reinforcement rough draft rough sketch sounding out standard strengthening substantiation support supporting evidence test test case touchstone trial try undergirding validation