“Poetry seems to me to exist in terms of its conciseness—how much can be packed in,” he told Bernard Levin in 1980.
[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.)