The study of meaning in a language is known as—

The correct option is semantics.

Explanation:

In linguistics, different branches study various aspects of human language:
1. Semantics: The branch of linguistics concerned with the study of meaning in language, including the meaning of words, phrases, signs, and symbols.
2. Syntax: The study of the structure of sentences and the rules governing how words combine to form grammatically correct sentences.
3. Morphology: The study of the internal structure of words and how words are formed from smaller units called morphemes.
4. Linguistics: The overall scientific study of language and its structure as a whole.

Therefore, the study of meaning in a language is specifically known as semantics.