Or (shorter) oimai (oy'-mahee) middle voice apparently from hoios; to make like (oneself), i.e. Imagine (be of the opinion) -- suppose, think.
see GREEK hoios
STRONGS NT 3633: οἴομαιοἴομαι, contracted οἶμαι; (from Homer down); to suppose, think: followed by an accusative with an infinitive John 21:25 (T omits the verse); by the infinitive alone, where the subjunctive and the objective are the same, Philippians 1:16 (17); by ὅτι, James 1:7. (Synonym: see ἡγέομαι, at the end.)