Englishfor English speakers
four
Determiner
—
(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
—
noun
any particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principle
interaction
Noun
—
An interaction is when two or more things affect each other or work together.
Poor health can harm older people's participation in everyday life and social interaction.
It is necessary to understand the interactions between the plant and its surroundings.
She should have a lot of interaction with other students, or with the teacher.