define vs involve

define

verb
  • To express the essential nature of something. 

  • To describe, explain, or make definite and clear; used to request the listener or other person to elaborate or explain more clearly his or her intended meaning of a word or expression. 

  • To establish the referent of a term or notation. 

  • To determine with precision; to mark out with distinctness; to ascertain or exhibit clearly. 

  • To demark sharply the outlines or limits of an area or concept. 

  • To state the meaning of a word, phrase, sign, or symbol. 

noun
  • A kind of macro in source code that replaces one text string with another wherever it occurs. 

involve

verb
  • To complicate or make intricate. 

  • To take in; to gather in; to mingle, blend or merge. 

  • To cause or engage (someone or something) to participate or to become connected or implicated. 

  • To comprise or include; to have as a related part. 

  • To envelop, enfold, entangle. 

How often have the words define and involve occurred in a corpus of books? (source: Google Ngram Viewer )