(India) The jungle babbler, Turdoides striata, habitually flocking in extended family groups.

(business) A group of seven oil companies that dominated the global petroleum industry from the mid-1940s to the 1970s.

(poetic) All of the oceans of the world. (In a common modern interpretation, the seven seas are the North and South Atlantic, North and South Pacific, Indian, Arctic and Antarctic, but historical interpretations differ widely; see the Wikipedia article for this.)

7,000

(gambling, dice games) in the game of craps, to roll a seven after having established the "point".

(biblical) The seals that secure the book or scroll that John of Patmos saw in an apocalyptic vision.

A children's game in which players with their eyes shut try to guess which of a group of seven people pressed down their thumbs.

(cricket) The batsman who bats seventh.

(colloquial, dated) A revolver which holds seven cartridges.

plural of seven-shooter