v. (developed, developing) 1 tr. & intr. a make or become bigger or fuller or more elaborate or systematic (the new town developed rapidly). b bring or come to an active or visible state or to maturity (developed a plan of action). 2 tr. begin to exhibit or suffer from (developed a rattle). 3 tr. a construct new buildings on (land). b convert (land) to a new purpose so as to use its resources more fully. 4 tr. treat (photographic film etc.) to make the latent image visible. 5 tr. Mus. elaborate (a theme) by modification of the melody, harmony, rhythm, etc. 6 tr. Chess bring (a piece) into position for effective use. developing country a poor or primitive country that is developing better economic and social conditions. developer n.
[ F développer f. Rmc (as DIS-, orig. of second element unknown) ]