(economics) A socioeconomic theory stating that economic relationships (such as being an owner or capitalist, or being a worker or proletarian) are the foundation upon which all other societal and political arrangements are based

The time between a sound or pulse of radio waves being produced and the receipt of the corresponding echo

plural of echo time

An extension of the European Union to include the European Free Trade Association.

A worldview where humans are closely related to other natural entities. A kincentric ecology generally includes all humans and all animals. It may also include entities such as plants, rivers, or rocks.

The branch of economics characterized by a concentration on monetary activities.

plural of row echelon form

(linguistics) Synonym of linguistic ecology

(linguistics) The study of how languages interact with each other and the places in which they are spoken.

Psittacula eques, a parrot endemic to the Mascarene Islands of Mauritius and formerly Réunion.