Question

explain means \to make plain or understandable; to give reasons for or causes of; to show the logical development or relationships of\

Explanation:

Answer:

The text provides a definition of the word "explain". If we consider the discipline and subfield, this falls under Arts, specifically Linguistics (as it's about the meaning of a word, which is a linguistic concern) or Etymology/Semantics (since it's defining a term, related to semantics which is about meaning in language). So the subfield is Linguistics (or Semantics/Etymology) under Arts.