Bible Dictionary · S
Son of man
(1.) Denotes mankind generally, with special reference to their weakness and frailty (Job 25:6; Ps 8:4; Ps 144:3; Ps 146:3; Isa 51:12, etc.).
(2.) It is a title frequently given to the prophet Ezekiel, probably to remind him of his human weakness.
(3.) In the New Testament it is used forty-three times as a distinctive title of the Saviour. In the Old Testament it is used only in Ps 80:17 and Dan 7:13 with this application. It denotes the true humanity of our Lord. He had a true body (Heb 2:14; Luke 24:39) and a rational soul. He was perfect man.
From Easton’s Bible Dictionary (1897), by Matthew George Easton.