To call on (a higher power) for assistance, support, or inspiration: "Stretching out her hands she had the air of a Greek woman who invoked a deity” ( Ford Madox Ford).
To appeal to or cite in support or justification.
To call for earnestly; solicit: invoked the help of a passing motorist.
To summon with incantations; conjure.
To resort to; use or apply: "Shamelessly, he invokes coincidence to achieve ironic effect” ( Newsweek).
Computer Science To activate or start (a program, for example).