Projection: The projection of the European Parliament is an estimate of its composition resulting from the elections, established by Verian as an aggregation of available election results, estimates or polling data published in the Member States after voting has finished. Without prejudice to the composition of the newly elected Parliament, the projection is based on the structure of the outgoing Parliament.

Provisional: Composition of the European Parliament based on available provisional or final national results published after voting has finished in all Member States, based on the structure of the outgoing Parliament.

Constitutive session: Results as officially announced by the newly-elected European Parliament after verification of its Members' eligibility criteria.

Outgoing Parliament: European Parliament configured as in the last parliamentary session of the ongoing legislature.