Englishfor English speakers
four
Determiner
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(ordinal fourth) The number 4. Four is one more than three and one less than five.
We have four fingers and one thumb on each hand.
four
Noun
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The number 4.
Two and two is four.
fermion
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noun
any particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principle
operator
Noun
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An operator is a person who operates something.
Jo is the operator of the tractor.
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An operator is a person who works on making connections for people over the telephone.
The operator was struggling to keep the line connected.