General Definition: 1. A vertical surface, line of things going left and right, or real or imaginary line on the ground in front of you, such as a barrier or fence, or a boundary of some sort, or any thing or any action easily associated with this, especially a row of things. As a Noun: 1. A number of people or things arranged in a line. English = row. 2. A line of seats in a theatre or a cinema. English = row.