English Dictionary
reactive
adj 1: (chemistry and physics) participating readily in reactions;
"sodium is a reactive metal"; "free radicals are very
reactive" [ant: {unreactive}]
2: tending to react to a stimulus; "the skin of the geriatric
is less reactive than that of younger persons"- Louis Tuft
English Computing Dictionary
RELATIVE
Early system on IBM 650. Listed in CACM 2(5):16 (May 1959).