Englishfor English speakers
atomic
Adjective
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Atomic means it is about atoms, which are very small.
The force of an atomic bomb comes from breaking an atom into pieces.
expression
Noun
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An expression is a group of words, like a phrase or sentence, often one that is used by many people.
"Read between the lines" is a common expression for knowing meanings that are not written or spoken.
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An expression is a group of numbers and variables.
The expression "2x + y - 3" was set equal eight in the equation.