ex·e·cute / ˈeksiˌkyoōt/ • v. [tr.] 1. carry out or put into effect (a plan, order, or course of action): the corporation executed a series of financial deals. ∎  perform (an activity or maneuver requiring care or skill): they had to execute their dance steps with the greatest precision. ∎  Law make (a legal instrument) valid by signing or sealing it. ∎  Law carry out (a judicial sentence, the terms of a will, or other order): police executed a search warrant. ∎ Comput. carry out an instruction or a program.2. (often be executed) carry out a sentence of death on (a legally condemned person): he was convicted of treason and executed. ∎  kill (someone) as a political act.

execute
A. carry into effect, carry out XIV; fulfil, discharge XIV; make valid by signing, etc.; carry out the design of, perform XVIII;

B. inflict capital punishment on XV. — (O)F. exécuter — medL. executāre, f. ex(s)ecũt-, pp. stem of L. ex(s)equĩ follow up, carry out, pursue judicially, punish, f. EX-1 + sequĩ follow.
So execution carrying into effect XIV; infliction of capital punishment XV; enforcement of a judgement, effective action XVI; hence executioner XVI. executive XVII; sb. XVIII (first U.S.). executor XIII (of an estate). — AN. executo(u)r — L. execũtor.

EXECUTE

To complete; to make; to sign; to perform; to do; to carry out according to its terms; to fulfill the command or purpose of. To perform all necessary formalities, as to make and sign a contract, or sign and deliver a note.

Execute is the opposite of executory, incomplete or yet to be performed.

execute To carry out an instruction or program. This includes interpreting machine instructions, performing subroutines, and applying functions to sets of parameters.