Englishfor English speakers
classic
Adjective
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If something is classic, it's typical.
Richard Branson is a classic example of success without schooling.
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If something is classic, it has a long history and it is liked.
His clothes were a mixture of classic and modern styles.
classic
Noun
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A classic is a book, play, song, etc. that has a long history and is liked.
Every time a classic like that comes on the radio, I just have to stop and listen.
This book has become a classic of Canadian fiction.
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(plural) The classics are the language and art from ancient Rome and Greece.
You've never read Homer? Schools don't teach the classics these days.
invariant
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adjective
unaffected by a designated operation or transformation
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noun
a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it
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adjective
(= constant, unvarying)
unvarying in nature
maintained a constant temperature
principles of unvarying validity