Rose George, author of the new book ninety Percent of Everything, on what keeps the world running.
They answered simultaneously: “ninety percent” and “fifteen percent” respectively.
ninety minutes later, I can still remember what Joe Biden said.
Old English nigontig, from nine + -tig "group of ten" (see -ty (1)). Cognate with Old Frisian niontich, Middle Dutch negentich, Dutch negentig, German neunzig.