The property of being seven in number.

The cardinal number immediately following twenty-six and preceding twenty-eight.

The cardinal number immediately following sixty-six and preceding sixty-eight.

(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.)

(Catholicism) The sacred counterparts of the seven deadly sins.

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

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

The cardinal number occurring after thirty-six and before thirty-eight.

The cardinal number immediately following seventy-six and preceding seventy-eight.

The cardinal number immediately following ninety-six and preceding ninety-eight.