north-northwest adjective 3adverb 1noun 1 adjective3 •Of, in or pertaining to the north-northwest; north-northwestern. •Situated toward or in the direction of north-northwest; north-northwestward; north-northwesterly.A north-northwest course. •Coming from the north-northwest; north-northwesterly.A north-northwest wind. adverb1 •Towards or in the direction of the north-northwest; north-northwestwards.We are travelling north-northwest at the moment. noun1 •The compass point halfway between northwest and north; specifically at a bearing of 337.5°.