/ˌɪnvəˈkeɪʃn/
in·vo·ca·tion
BrE /ˌɪnvəˈkeɪʃn/
NAmE /ˌɪnvəˈkeɪʃn/
[U, C]
(formal)
the act of asking for help, from a god or from a person in authority; the act of referring to sth or of calling for sth to appear
(computing)
the act of making a particular function start