1a broad road in a town or city, typically having trees at regular intervals along its sides:tree-lined avenues surround the hotel [in names]:Shaftesbury Avenue
[in names]North American a thoroughfare running at right angles to the streets in a city laid out on a grid pattern:7th Avenue
British a tree-lined approach to a country house or similar building:an avenue of limes
2a way of approaching a problem or making progress towards something:three possible avenues of research suggested themselves