target language

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

• noun The language into which a text written in another language is to be translated.
• noun A language that a nonnative speaker is in the process of learning.
• noun Computers The computer language, often a machine language, into which a document written in another computer language is to be translated.

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

• noun the language into which a text is to be translated; -- correlative of source language.

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

• noun linguistics, translation studies The language into which a translation is done.
• noun computing The machine language into which source code is to be compiled

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

• noun a computer language into which something written in another computer language is to be translated
• noun the language into which a text written in another language is to be translated