Of the highest quality, excellent, or superior in performance or character.
This term comes from the British Royal Navy's classification system established in the 17th century, where warships were categorized into six 'rates' based on their size and firepower. First-rate ships were the largest and most powerful, carrying 100 or more guns and representing the pinnacle of naval strength.
The naval rating system was so influential that it gave us both 'first rate' for excellence and 'third rate' for poor quality, though ironically third-rate ships were still formidable vessels with 64-80 guns. The precision of this military classification system made it a perfect metaphor for quality gradations in civilian life.
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