entrainment

1. (now rare) Enthusiasm, liveliness; impulsiveness.Examples: "Carlo Antonio Bertinazzi, he whom the French stage knows under the name of Carlin, was the gayest of all comedians; he knew a thousand ways of amusing his audience, and would make them die with pleasure and laughter by his affecting performance of the Vingt-six infortunes d’ Arlequin; the entrainment of his gaiety and bonhomie were everywhere extolled."; "A philosopher, through indolence and carelessness before the Revolution, superstitious afterwards, through weakness and entrainment [translating entraînement], he threatened the Revolution with his sword from a distance."; "At page 60, and elsewhere, the English general is only spoken of as a mere nobody, carried away resistlessly by the “entrainments” [translating entraînements] around him."archaiccountableuncountable

2. (biology) The alignment of an organism's circadian rhythm to an external rhythm in its environment.countableuncountable