VOLATILE

I. adjective Etymology: French, from Latin volatilis, from volare to fly Date: 1605 readily vaporizable at a relatively low temperature, flying or having the power to fly, 3. lighthearted , lively , easily aroused , tending to erupt into violence ; explosive , 4. unable to hold the attention fixed because of an inherent lightness or fickleness of disposition, characterized by or subject to rapid or unexpected change , difficult to capture or hold permanently ; evanescent , transitory , ~ness noun volatility noun II. noun Date: 1686 a ~ substance