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[Conciseness] is the English word familiar to the ordinary man: concision is the LITERARY CRITIC'S WORD, more recent in English, used by writers under French influence & often requiring the reader to stop & think whether he knows its meaning. [Fowler]
Economy in writing or speaking. “Bill loves to go to the movies because watching films is a real pleasure to him” is not as concise as “Bill loves to watch movies.” (Compare circumlocution.)