d11n Share definition Flag Short form of word 'documentation'. '11' means eleven omitted letters (o, c, u, m, ...) between first d and last n. Person #1: this stupid server doesn't work... Person #2: see sect. 2 of d11n d11n by nnivanov July 21, 2009 0 0 Get merch Get the d11n mug. Buy Now — $32.95 See more merch