Easton's Bible Dictionary
(4.) One blesses another when he expresses good wishes or offers prayer to God for his welfare (Genesis 24:60; 31:55; 1 Samuel 2:20). Sometimes blessings were uttered under divine inspiration, as in the case of Noah, Isaac, Jacob, and Moses (Genesis 9:26, 27; 27:28, 29, 40; 48:15-20; 49:1-28; Deuteronomy 33). The priests were divinely authorized to bless the people (Deuteronomy 10:8; Numbers 6:22-27). We have many examples of apostolic benediction (2 Corinthians 13:14; Ephesians 6:23, 24; 2 Thessalonians 3:16, 18; Hebrews 13:20, 21; 1 Peter 5:10, 11).
(5.) Among the Jews in their thank-offerings the master of the feast took a cup of wine in his hand, and after having blessed God for it and for other mercies then enjoyed, handed it to his guests, who all partook of it. Psalm 116:13 refers to this custom. It is also alluded to in 1 Corinthians 10:16, where the apostle speaks of the "cup of blessing."
Noah Webster's New International Dictionary of the English Language
1. (v. t.) To make or pronounce holy; to consecrate
2. (v. t.) To make happy, blithesome, or joyous; to confer prosperity or happiness upon; to grant divine favor to.
3. (v. t.) To express a wish or prayer for the happiness of; to invoke a blessing upon; -- applied to persons.
4. (v. t.) To invoke or confer beneficial attributes or qualities upon; to invoke or confer a blessing on, -- as on food.
5. (v. t.) To make the sign of the cross upon; to cross (one's self).
6. (v. t.) To guard; to keep; to protect.
7. (v. t.) To praise, or glorify; to extol for excellences.
8. (v. t.) To esteem or account happy; to felicitate.
9. (v. t.) To wave; to brandish.