machine language

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A set of instructions for a specific central processing unit, designed to be usable by a computer without being translated.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Computers) a set of instructions{3} in a binary form that can be executed directly by the CPU of a computer without translation by a computer program.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun programming The set of instructions that a particular computer is designed to execute; generated from a high-level language by an assembler, compiler or interpreter.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a set of instructions coded so that the computer can use it directly without further translation
• noun a programming language designed for use on a specific class of computers