Definition of "Aa"

Several waterways in Europe.

1. A river in northern France, flowing 93 km from near Bourthes, Pas-de-Calais department into the North Sea near Gravelines, Nord department.  examples

2. A small river in the Netherlands, flowing 72 km from near Nederweert, Limburg into the Dieze at 's-Hertogenbosch, North Brabant.  examples

3. A tributary of the Möhne river in North Rhine-Westphalia, Germany, part of the Rhine basin.  examples

4. A tributary of the Nether river in North Rhine-Westphalia, Germany, part of the Weser basin.  examples

5. A tributary of the Werre river in North Rhine-Westphalia, Germany, part of the Weser basin.  examples

A village in Ida-Viru County, northern Estonia, on the Gulf of Finland.  examples

A surname from Norwegian.  examples