From WordNet (r) 3.0 (2006) [wn]:
Ottawa
n 1: a member of the Algonquian people of southern Ontario
2: a river in southeastern Canada that flows along the boundary
between Quebec and Ontario to the Saint Lawrence River near
Montreal [syn: Outaouais, Ottawa, Ottawa river]
3: the capital of Canada (located in southeastern Ontario across
the Ottawa river from Quebec) [syn: Ottawa, {Canadian
capital}, capital of Canada]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ottawas \Ot"ta*was\, n. pl.; sing. Ottawa. (Ethnol.)
A tribe of Indians who, when first known, lived on the Ottawa
River. Most of them subsequently migrated to the southwestern
shore of Lake Superior.
[1913 Webster]