A noteworthy act is an action that is considered to be particularly impressive or significant. The term 'noteworthy act' can refer to a variety of different things, such as a heroic deed, a charitable act, or an accomplishment that is particularly praiseworthy. In this case, the crossword solution for the term 'noteworthy act' is FEAT, which is an abbreviation for 'featuring, ' meaning to highlight or emphasize something. Therefore, a noteworthy act is an action that is highlighted or emphasized due to its significance.