Adjective
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incapable of being changed or moved or undone
e.g. "frozen prices"
"living on fixed incomes"
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securely placed or fastened or set
"a fixed piece of wood"
"a fixed resistor"
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fixed and unmoving
"with eyes set in a fixed glassy stare"
"his bearded face already has a set hollow look"- Connor Cruise O'Brien
"a face rigid with pain"
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(of a number) having a fixed and unchanging value