These nouns refer to a portion or length of time. Period is the most general: a short waiting period; a difficult period of my life; the Romantic period in music.Epoch refers to a period regarded as being remarkable or memorable: “We enter on an epoch of constitutional retrogression” (John R. Green). An era is a period of time notable because of new or different aspects or events: “How many a man has dated a new era in his life from the reading of a book” (Henry David Thoreau). An age is usually a period marked by a distinctive characteristic: the age of Newton; the Iron Age. A term is a period of time to which limits have been set: Senators are elected for a term of six years.
There is a period in the history of the individual, as of the race, when the hunters are the "best men," as the Algonquins called them.
"You started your period," he stated flatly.
For the Pavlograd hussars, however, the whole of this retreat during the finest period of summer and with sufficient supplies was a very simple and agreeable business.
So one might have thought that regarding this period of the campaign the historians, who attributed the actions of the mass to the will of one man, would have found it impossible to make the story of the retreat fit their theory.
If the aim of the Russians consisted in cutting off and capturing Napoleon and his marshals--and that aim was not merely frustrated but all attempts to attain it were most shamefully baffled--then this last period of the campaign is quite rightly considered by the French to be a series of victories, and quite wrongly considered victorious by Russian historians.