assembler
US /əˈsem.blɚ/
UK /əˈsem.blɚ/

1.
a person who assembles something, especially a machine or its components.
:
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The car factory employs many skilled assemblers.
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Each assembler is responsible for quality control.
2.
a program that converts instructions written in assembly language into machine code.
:
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The programmer used an assembler to convert the code.
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Learning about assembler is crucial for low-level programming.