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Pronunciation varies by accent · noun
The mark that shows the location or call number of a book or manuscript within a library; (loosely) synonym of call number..
Use shelf mark when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Shelf mark means The mark that shows the location or call number of a book or manuscript within a library; (loosely) synonym of call number..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use shelf mark where its definition matches the intended context.
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