Synonym: infrequent, peculiar, scarce, sparse, uncommon, unusual. Antonym: dense, ordinary. Similar words: literary, contrary, temporary, contemporary, to the contrary, on the contrary. Meaning: [rer /reə] 
adj. 1. not widely known; especially valued for its uncommonness 2. recurring only at long intervals 3. not widely distributed 4. marked by an uncommon quality; especially superlative or extreme of its kind 5. having low density 6. (of meat) cooked a short time; still red inside.
adj. 1. not widely known; especially valued for its uncommonness 2. recurring only at long intervals 3. not widely distributed 4. marked by an uncommon quality; especially superlative or extreme of its kind 5. having low density 6. (of meat) cooked a short time; still red inside. 
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271. This may well be one of those rare occasions when light aircraft pilots have the opportunity to shape something that affects them.
272. We hope the trend continues, until such aural excursions become a regular happening rather than a rare treat.