also two thirds
Two-thirds of something is an amount that is two out of three equal parts of it.
Two-thirds of householders in this country live in a mortgaged home...
QUANT : QUANT of n
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Two-thirds is also a pronoun.
The United States and Russia hope to conclude a treaty to cut their nuclear arsenals by two-thirds.
PRON
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Two-thirds is also an adverb.
Do not fill the container more than two-thirds full...
A second book has already been commissioned and is two-thirds finished.
ADV : ADV adj / -ed
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Two-thirds is also an adjective.
...the two thirds majority in parliament needed to make constitutional changes.
ADJ : ADJ n