Definition of "cumulus"

There were some new cumuli in the east, out above the water, and they began to take the late afternoon sun.

1919, Henry B[lake] Fuller, “Cope Enlivens the Country”, in Bertram Cope’s Year: A Novel, Chicago, Ill.: Ralph Fletcher Seymour, The Alderbrink Press, page 102

Ironically, there is something rather cloudlike about the multiple complaints surrounding Google. The issues are best parted into two cumuli: a set of “public” arguments about how to regulate Google; and a set of “private” ones for Google’s managers, to do with the strategy the firm needs to get through the coming storm.

2007 September 1, "Who’s afraid of Google?: The world’s internet superpower faces testing times", in The Economist, The Economist Newspaper Ltd, ISSN 0013-0613, volume 384, number 8544, page 9