1.
rare, uncommon, hard to find
Something that is scarce, unusual, or difficult to obtain. Widely used in collecting, gaming, and everyday conversation.
Usage
Sense 1 is extremely common in gaming and collecting culture, where items are graded by rarity (レア, スーパーレア, ウルトラレア). It has spread into general conversation as a casual way to say something is uncommon or special. The Japanese word 珍しい covers similar ground but is the standard native word.
Sense 2 is used when ordering steak at restaurants. The doneness scale in Japanese is: レア → ミディアムレア → ミディアム → ウェルダン.
Common collocations
Related Words
Synonym:
珍しい (rare, unusual)
Compare:
稀少 (rare)
Compare:
生焼け (undercooked)
Compare:
半生 (half-raw)