As a Noun: 1. The act of explaining to someone how to do something, especially by also showing them what to do. English = demonstration, instruction. 2. A person who shows someone how to do something. English = instructor. 3. Giving someone instructions and information about something so that they know about it or know how to do it. English = teaching, education. As a Verb or Adjective: 1. To explain to someone how to do something, especially by also showing them what to do. English = demonstrate, instruct. 2. To give someone instructions and information about something so that they know about it or know how to do it. English = teach, educate.