The difference between Plurale tantum and Uncountable
When used as nouns, plurale tantum means a noun (in any specific sense) that has no singular form, such as (in most usage), whereas uncountable means an uncountable noun.
Uncountable is also adjective with the meaning: so many as to be incapable of being counted.
check bellow for the other definitions of Plurale tantum and Uncountable
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Plurale tantum as a noun (grammar):
A noun (in any specific sense) that has no singular form, such as (in most usage).
Examples:
"Roger wasn’t sure whether “jeans” was a true plurale tantum, since the word “jean” exists and describes a type of cloth."
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Uncountable as an adjective:
So many as to be incapable of being counted.
Examples:
"The reasons for our failure were as uncountable as the grains of sand on a beach."
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Uncountable as an adjective (mathematics):
Incapable of being put into one-to-one correspondence with the natural numbers or any subset thereof.
Examples:
"Cantor’s “diagonal proof” shows that the set of real numbers is uncountable."
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Uncountable as an adjective (grammar, of a noun):
Describes a meaning of a noun that cannot be used freely with numbers or the indefinite article, and which therefore usually takes no plural form. Example: information.
Examples:
"Many languages do not distinguish countable nouns from uncountable nouns."
"One meaning in law of the supposedly uncountable noun "information" is used in the plural and is countable."
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Uncountable as a noun (linguistics):
An uncountable noun.