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v. con·served, con·serv·ing, con·serves
a. To protect from loss or harm; preserve: calls to conserve our national heritage in the face of bewildering change.
b. To use carefully or sparingly, avoiding waste: kept the thermostat lower to conserve energy.
2. To keep (a quantity) constant through physical or chemical reactions or evolutionary changes.
3. To preserve (fruits) with sugar.
To economize: tried to conserve on fuel during the long winter.
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- in Indo-European roots.]