1.Definition: a horizontal (or nearly horizontal) passageway in a mine

Related Noun(s):drift, gallery

Category: Objects

2.Definition: a line of text serving to indicate what the passage below it is about

"The heading seemed to have little to do with the text"

Related Noun(s):head, header

Category: General

3.Definition: the direction or path along which something moves or along which it lies

Related Noun(s):aim, bearing

Category: Places