Concise Bible Dictionary:

The sum paid by a man to the relatives of the woman who becomes his wife (Gen. 34:1212Ask me never so much dowry and gift, and I will give according as ye shall say unto me: but give me the damsel to wife. (Genesis 34:12); Ex. 22:16-1716And if a man entice a maid that is not betrothed, and lie with her, he shall surely endow her to be his wife. 17If her father utterly refuse to give her unto him, he shall pay money according to the dowry of virgins. (Exodus 22:16‑17); 1 Sam. 18:2525And Saul said, Thus shall ye say to David, The king desireth not any dowry, but an hundred foreskins of the Philistines, to be avenged of the king's enemies. But Saul thought to make David fall by the hand of the Philistines. (1 Samuel 18:25): Compare Hos. 3:22So I bought her to me for fifteen pieces of silver, and for an homer of barley, and an half homer of barley: (Hosea 3:2)). Leah, on having her sixth son, piously said, “God hath endued me with a good dowry” (Gen. 30:2020And Leah said, God hath endued me with a good dowry; now will my husband dwell with me, because I have born him six sons: and she called his name Zebulun. (Genesis 30:20)). The dowry which Jacob gave for his wives was seven years’ service for each (Gen. 29:18,2718And Jacob loved Rachel; and said, I will serve thee seven years for Rachel thy younger daughter. (Genesis 29:18)
27Fulfil her week, and we will give thee this also for the service which thou shalt serve with me yet seven other years. (Genesis 29:27)