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Synonyms
con·serve (kən-sûrv́)

[Middle English conserven, from Old French conserver, from Latin cōnservāre, com-, intensive pref.; see com–, + servāre, to preserve.]

verb: -served, -serv·ing, -serves. 

transitive verb 

    1. To protect from loss or harm; preserve: calls to conserve our national heritage in the face of bewildering change.
    2. 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.

intransitive verb 

To economize: tried to conserve on fuel during the long winter.

noun 

A jam made of fruits stewed in sugar.

derivatives

con·serv́a·ble
adjective
con·serv́er
noun