Pronunciation: (up'ur-mōst" or, esp. Brit., -must),[key] —adj.Also,upmost. 1. highest in place, order, rank, power, etc.: the uppermost peaks of the mountain; the uppermost class of society. 2. topmost; predominant: a subject of uppermost concern.
—adv. in or into the uppermost place, rank, or predominance: The blossoms grow uppermost on the stems of these flowers; the thoughts that came uppermost to her mind.