Definition of execute. executed. ; executing. transitive verb. 1 : to carry out fully : put completely into effect execute a command. 2 : to do what is provided or required by execute a decree. 3 : to put to death especially in compliance with a legal sentence. 4 : to make or produce (as a work of art) especially by carrying out a design. 5 : to perform what is required to give validity to execute a deed. 6 : play execute a piece of music.