Used chiefly in fixed phrases (e.g., 'full well') meaning 'completely' or 'very'.
She knew full well that he was lying.
Elle savait parfaitement bien qu’il mentait.
Mostly in the phrase 'the full', meaning the maximum or highest point or amount.
The river was at the full after days of rain.
La rivière était dans sa plénitude après des jours de pluie.
pleniluneTerme littéraire pour la phase de pleine lune.