Boyd’s Bible Dictionary:

The king of Egypt to whom Jeroboam fled
(1 Kings 11:40). He invaded Judea, B. C. 969, defeated Rehoboam, and spoiled the temple (1 Kings 14:25-26; 2 Chron. 12:2-9). Inscriptions, reliefs, and statuary at Karnak, on the Nile, record his invasion of Palestine.

Concise Bible Dictionary:

King of Egypt, to whom Jeroboam fled for protection from Solomon. Shishak afterward invaded Judah during the reign of Rehoboam, “because they had transgressed against the Lord.” He came with an immense army, took fenced cities, and pillaged Jerusalem and the temple. Shishak left an account of this expedition. It gives a long list of places conquered, among which are the names of many Jewish towns, as Taanach, Rehob, Mahanaim, Gibeon, Beth-horon, Kedemoth, Aijalon and Megiddo (1 Kings 11:40; 1 Kings 14:25-26; 2 Chron. 12:2-9). See EGYPT.

Strong’s Dictionary of Hebrew Words:

or Shuwshaq {shoo-shak'}; of Egyptian derivation; Shishak, an Egyptian king
KJV Usage:

Jackson’s Dictionary of Scripture Proper Names:

greedy of fine linen: he who will give drink

Potts’ Bible Proper Names:

Like to a river; present of the bag or the pot:―an Egyptian king, 1 Kings 11:40. {Similis rivo}