Boyd’s Bible Dictionary:
(seeing). An inspired dream, fantasy, or apparition (Num. 24:4; Isa. 6; Ezek. 1; 8-10; Dan. 7; 8; Acts 26:13-19).
Concise Bible Dictionary:
By means of visions God often vouchsafed to make known His will. When Samuel was a child, before the word of Jehovah was revealed to him, for a time “there was no open vision” (1 Sam. 3:1, 15). With the prophets they were frequently employed: more than twenty times we read of them in Daniel. In the future when the Spirit will be poured out, Israel’s sons and daughters will prophesy; the old men will dream dreams, and the young men will see visions (Joel 2:28; Acts 2:17). The book of Revelation is a series of visions (Rev. 1:2).