To put into effect; carry out: a government that executes the decisions of the ruling party. To perform; do: execute a U-turn. See Synonyms at perform. To create (a work of art, for example) in accordance with a prescribed design. To make valid, as by signing: execute a deed. To perform or carry out what is required by: execute the terms of a will. To put to death, especially by carrying out a lawful sentence. Computer Science To run (a program or an instruction).