control
 con·trol (kən-trōlʹ)tr.v. con·trolled, con·trol·ling, con·trols
1. To exercise authoritative or dominating influence over; direct. See Synonyms at conduct.
2. To adjust to a requirement; regulate:
controlled trading on the stock market; controls the flow of water.
3. To hold in restraint; check:
struggled to control my temper.
4. To reduce or prevent the spread of:
control insects; controlled the fire by dousing it with water.
5.
a. To verify or regulate (a scientific experiment) by conducting a parallel experiment or by comparing with another standard.
b. To verify (an account, for example) by using a duplicate register for comparison.n.
1. Authority or ability to manage or direct:
lost control of the skidding car; the leaders in control of the country.
2.
a. One that controls; a controlling agent, device, or organization.
b. An instrument or set of instruments used to operate, regulate, or guide a machine or vehicle. Often used in the plural.
3. A restraining device, measure, or limit; a curb:
a control on prices; price controls.
4.
a. A standard of comparison for checking or verifying the results of an experiment.
b. An individual or group used as a standard of comparison in a control experiment.
5. An intelligence agent who supervises or instructs another agent.
6. A spirit presumed to speak or act through a medium. [Middle English controllen, from Anglo-Norman contreroller, from Medieval Latin contrārotulāre, to check by duplicate register, from contrārotulus, duplicate register : Latin contrā-, contra- + Latin rotulus, roll, diminutive of rota, wheel; See ret- in Indo-European Roots.] con·trol'la·bilʹi·ty n.con·trolʹla·ble adj.con·trolʹla·bly adv.
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