The action of reassay ; an instance of this, a second or subsequent assay.
Mid 18th century; earliest use found in Acts of Assembly, Island Jamaica. Either from re- + assay, or directly from reassay.
1To retest the purity of (a metal or ore).
2To perform a second or subsequent biochemical, physiological, or immunological assay of (a sample) to assess the strength or activity of a biologically active substance.
Late 16th century (in an earlier sense). From re- + assay.