Physically above and in contact with. / Physically directly supported by. / Being followed by another so as to form a series. / At (a prescribed point in time). / On.

(obsolete) by the by; incidentally

(transitive, slightly more formal) Alternative form of dwell on

(figuratively) To discover or find something by accident. / (figuratively) To meet somebody by chance.

To take action on the basis of information received or deduced.

To consider or regard something in a specific manner. / To gaze at something; to look on.

To (either knowingly or unwittingly) cause to befall.

present participle of reckon upon

Third-person singular simple present indicative form of reckon upon

simple past tense and past participle of reckon upon