As a Noun: 1. The strong feeling that you must have something or must do something. English = need. 2. The need to do something. English = necessity. As a Verb or Adjective: 1. To be necessary to have or do something; to have a strong feeling that you must have something or must do something. English = need. 2. To be needed to get the result or the effect that you want. English = (be) necessary. Note: 1. The variants with repeated movements are more strongly associated with ‘necessity’ or ‘necessary’.