con·serve (kən-sûrv') v.
con·served, con·serv·ing, con·serves
v.
tr.
To protect from loss or harm; preserve: calls to conserve our national heritage in the face of bewildering change.
To use carefully or sparingly, avoiding waste: kept the thermostat lower to conserve energy.
To keep (a quantity) constant through physical or chemical reactions or evolutionary changes.
To preserve (fruits) with sugar.
v.
intr. To economize: tried to conserve on fuel during the long winter. n.
(kŏn'sûrv') A jam made of fruits stewed in sugar.
[Middle English conserven, from Old French conserver, from Latin cōnservāre : com-, intensive pref.; see com- + servāre, to preserve; see ser-1 in Indo-European roots.] con·serv'a·ble adj., con·serv'er n.