substantiate

sub|stan|ti|ate /səbst'ænʃieɪt/ (substantiates substantiating substantiated)
[VERB] V n
To substantiate a statement or a story means to supply evidence which proves that it is true. (FORMAL)
There is little scientific evidence to substantiate the claims.
= validate
substantiation [N-UNCOUNT]
There may be alternative methods of substantiation other than written records.

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