Rare, a. [Compar. Rarer; superl. Rarest.]
Etymology: [F., fr. L. rarus thin, rare.]
1. Not frequent; seldom met with or occurring; unusual; as, a rare event.
2. Of an uncommon nature; unusually excellent; valuable to a degree seldom found. Rare work, all filled with terror and delight. Cowley. Above the rest I judge one beauty rare. Dryden.
3. Thinly scattered; dispersed. Those rare and solitary, three in flocks. Milton.
4. Characterized by wide separation of parts; of loose texture; not thick or dense; thin; as, a rare atmosphere at high elevations. Water is nineteen times lighter, and by consequence nineteen times rarer, than gold. Sir I. Newton.
1 more senses
Syn. -- Scarce; infrequent; unusual; uncommon; singular; extraordinary; incomparable. -- Rare, Scarce. We call a thing rare when but few examples, specimens, or instances of it are ever to be met with; as, a rare plant. We speak of a thing as scarce, which, though usually abundant, is for the time being to be had only in diminished quantities; as, a bad harvest makes corn scarce. A perfect union of wit and judgment is one of the rarest things in the world. Burke. When any particular piece of money grew very scarce, it was often recoined by a succeeding emperor. Addison.
2 other Webster entries under this spelling
Rare, a.
Early. [Obs.] Rude mechanicals that rare and late Work in the market place. Chapman.
Rare, a. [Compar. Rarer; superl. Rarest.]
Nearly raw; partially cooked; not thoroughly cooked; underdone; as, rare beef or mutton. New-laid eggs, which Baucis' busy care Turned by a gentle fire, and roasted rare. Dryden.
Note: This word is in common use in the United States, but in England its synonym underdone is preferred.
Shades of meaning
Unique is alone of its kind; rare is infrequent of its kind; great poems are rare; "Paradise Lost" is unique. To say of a thing that it is rare is simply to affirm that it is now seldom found, whether previously common or not; as, a rare old book; a rare word; to call a thing scarce implies that it was at some time more plenty, as when we say food or money is scarce. A particular fruit or coin may be rare; scarce applies to demand and use, and almost always to concrete things; to speak of virtue, genius, or heroism as scarce would be somewhat ludicrous. Rare has the added sense of precious, which is sometimes, but not necessarily, blended with that above given; as, a rare gem. Extraordinary, signifying greatly beyond the ordinary, is a neutral word, capable of a high and good sense or of an invidious, opprobrious, or contemptuous signification; as, extraordinary genius; extraordinary wickedness; an extraordinary assumption of power; extraordinary antics; an extraordinary statement is incredible without overwhelming proof.