1.Definition: (of a number) having a fixed and unchanging value

2.Definition: fixed and unmoving

"With eyes set in a fixed glassy stare"

Related Adjective(s):rigid, set

3.Definition: incapable of being changed or moved or undone; e.g.

"Living on fixed incomes"

Related Adjective(s):frozen

4.Definition: securely placed or fastened or set

"A fixed piece of wood", "A fixed resistor"