1. Espace de temps plus ou moins long que l'on envisage soit du point de vue de sa durée, soit du point de vue de sa situation dans un espace de temps plus long : Partir pour une période de deux ans.Pendant la période des fêtes.
2. Intervalle de temps, moment d'une œuvre, d'une carrière, d'une vie, caractérisés par certains événements ou certains aspects : Une période difficile de ma vie.La période rose de Picasso.
4. Temps nécessaire pour qu'une quantité donnée d'une substance diminue de moitié.
Chimie
5. Ensemble des éléments figurant, dans le tableau périodique, entre deux gaz rares successifs.
Géologie
6. Unité géochronologique correspondant, d'un point de vue chronostratigraphique, au système et qui se place hiérarchiquement entre l'ère et l'époque.
Mathématiques
7. Plus petit nombre T tel que la fonction f vérifie f(x + T) = f(x) pour tout x. (Pour étudier une fonction f possédant une période T, il suffit de se restreindre à un intervalle d'étendue T. Les fonctions circulaires sont des exemples de fonctions périodiques : la période est 2π pour sin et cos, et π pour tg et cotg.)
Musique
8. Fragment d'une phrase musicale.
Pathologie
9. Chacune des phases d'une maladie aiguë, ou chacun des stades d'évolution d'une maladie chronique.
Physique
10. Intervalle de temps constant après lequel, dans l'évolution d'un phénomène dit périodique, une grandeur reprend de nouveau la même valeur.
11. Évolution du phénomène pendant cet intervalle.
12. Inverse de la fréquence d'un phénomène périodique.
Rhétorique
13. Phrase composée de plusieurs propositions présentant un enchaînement et un rythme harmonieux.
périodes
nom féminin pluriel
Vieux. Menstrues.
Expressions avec période
période
nom féminin
Par périodes,
par moments, par intervalles.
Astronomie
Période de révolution,
en parlant d'un corps en mouvement orbital autour d'un autre, intervalle de temps séparant deux passages consécutifs de ce corps en un point quelconque de son orbite.
suite de plusieurs années séparant deux événements survenant à intervalles réguliers.
Droit
Période constitutive,
durée nécessaire à la constitution d'une société anonyme.
Éthologie
Période critique ou sensible,
moment privilégié du développement de l'individu où s'effectue l'acquisition ou le perfectionnement de certains schémas moteurs.
Mathématiques
Période d'un développement décimal illimité,
partie formée des décimales qui se répètent indéfiniment.
Militaire
Période (d'exercice),
séjour sous les drapeaux de courte durée, effectué par les hommes de la disponibilité et de la réserve pour entretenir et actualiser leurs connaissances militaires.
Physique
Période propre,
durée d'un cycle d'une oscillation libre d'un dispositif donné.
Période radioactive,
temps au bout duquel la moitié des atomes, initialement présents, d'un radioélément ont disparu par désintégration radioactive.
Difficultés de période
GENRE
Toujours féminin (il traverse une période difficile), sauf dans l'expression littéraire et aujourd'hui très rare au plus haut période signifiant « au point le plus haut » (au plus haut période de son bonheur).
Citations avec période
Maurice Blanchot (Quain, Saône-et-Loire, 1907-Le Mesnil-Saint-Denis 2003) Dans les périodes dites heureuses, seules les réponses semblent vivantes. L'Espace littéraire, Gallimard
George Santayana (Madrid 1863-Rome 1952) La civilisation approche peut-être d'un de ces longs hivers qu'elle connaît de temps en temps. La période chrétienne, pittoresque, passionnée et malheureuse, peut prendre fin. Une catastrophe de ce genre ne devrait pas nous désespérer. Civilization is perhaps approaching one of those long winters that overtake it from time to. Romantic Christendom - picturesque, passionate, unhappy episode - may be coming to an end. Such a catastrophe would be no reason for despair. Characters and Opinions in the United States
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