definition of
[heading]

[1] #1 heading n. [header, head] 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". wn

[2] #2 heading n. [bearing, aim] the direction or path along which something moves or along which it lies. wn

[3] #3 heading n. [drift, gallery] a horizontal (or nearly horizontal) passageway in a mine; "they dug a drift parallel with the vein". wn