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Definition of uppermost : Highest in place, position, rank, power, or the like; upmost; supreme.

Synonyms:

elevated, it's now or never, high, on the front burner, urgent, aloft, high up, exigent, imperative, pressing, every minute counts, upmost, immediate, over, upper, as a matter of urgency/priority

apex, top, extreme, pinnacle, highest, loftiest, topmost, summit, peak, tip, acme, capping, culminating

greatest

crowning, furthest, foremost, master, consummate, champion, king, choice, chief, senior, dominant, controlling, best, maximum, signal, sovereign, elite, leading, A-1, eminent, above, paramount, most, predominant, quintessential, furthermost, ruling, chosen, supreme, superior, better, commanding, headmost, zenith, ascendant

Usage examples:

• " There's a deal I'd like to say, but the things that come uppermost are all foolish. - "Hetty Wesley", Sir Arthur Thomas Quiller-Couch.
• Up flew the bright little coin, and down it came with the goddess of liberty uppermost. - "Spinning-Wheel Stories", Louisa May Alcott.
• 1164. It is obvious also that the flat place being turned uppermost, will facilitate the use of the file on work of smaller diameter than the lathe centre, and that placed in the position shown in the cut, it will permit a squaring tool to pass clear down to the centre and avoid leaving the projecting burr which is left when the tool cannot pass clear down the face to the edge of the countersink of the work centre. - "Modern Machine-Shop Practice, Volumes I and II", Joshua Rose.