Avifauna: The birds that are part of the fauna of an area.

Benthic: Relating to an aquatic ecosystem on or in the immediate vicinity of the bed. Benthic populations are referred to as "benthos".

Blackout: A general power cut due to a difference between the supply and demand on the electricity grid.

Consortium: A group of companies that has been formed to execute a financial or economic transaction.

Dismantlement: The final stage of a project that involves taking the wind turbine apart, removing project-related equipment from the site, and rehabilitating the site to its initial purpose, or for another purpose that has been collectively agreed upon.

Energy dependency or independence: The relationship between primary energy production and primary energy consumption. An area that is energy dependent must import energy to fulfil its needs.

Sustainable development: A mode of economic development that aims to reconcile social and economic progress and environmental conservation.

Fossil fuels: Fuels that are produced by the decomposition of organic matter after a process lasting several tens of millions of years. They are trapped in geological formations.
This energy is not considered as renewable because it takes a very long time to replenish the fossil reserves.  (Examples: oil, natural gas, and coal).

Marine renewables: All the technologies that leverage the flux of energies that the seas and oceans naturally provide (currents, tides, and thermal energy).

Wind turbine: A machine that converts wind energy into electricity. Wind turbines produce renewable energy. They can be installed onshore or offshore.

Industry: All the upstream and downstream complementary industries that contribute to the execution of an end product.

Floating base: In the future, for wind farms in deep water, and in very deep water as well (deeper than 60 metres, as opposed to a static wind turbine). The structure's stability and ability to float (held by mooring lines) enable it to withstand oscillations.

Gravity base: Concrete structure placed on the seabed.

Jacket foundation: Metal lattice fastened to the seabed with several piles. This is the solution that has been chosen for the wind farm in the Bay of Saint-Brieuc.

Monopile foundation: A tubular pile made of metal driven into the seabed.

Triple pile foundation: Tubular structure fastened to the seabed with three piles.

Greenhouse gases (GHGs): Gases that absorb the infrared radiation emitted by the earth's surface. They thus contribute to the greenhouse gas effect. It is suspected that the increase in the GHG concentration of the earth's atmosphere has caused the recent global warming.

Contracting authority: A legal entity that builds, uses, or operates structures. The contracting authority designs the project, ensures that it is feasible, draws up the execution process, and funds it. Ailes Marines is the contracting authority of the Bay of Saint-Brieuc wind farm project.

Mast: A wind turbine component that raises the blades to the right height, where the wind speed is the highest.

Nacelle: A wind turbine component at the top of the mast that supports the rotor, gearbox, and generator.

Natura 2000: A network of natural and semi-natural sites in the European Union that represent a significant heritage due to their exceptional flora and fauna. The "Habitat, Fauna, and Flora Directive" dated 21 May 1992 established Natura 2000.

Halieutic resource: The living plant and animal resource in marine aquatic environments that humans use (fishing and aquaculture).

Rotor: The mobile component of a wind turbine.

Watt: The fundamental unit of electric power. The watt-hour is the unit of energy produced or consumed in one hour.