All 11 Uses of

pious
in
Middlemarch

She felt sure that she would have accepted the judicious Hooker, if she had been born in time to save him from that wretched mistake he made in matrimony; or John Milton when his blindness had come on; or any of the other great men whose odd habits it would have been glorious piety to endure; but an amiable handsome baronet, who said "Exactly" to her remarks even when she expressed uncertainty,—how could he affect her as a lover?†
Chpt 1

piety = religious or highly moral belief/behavior OR (more rarely) devotion or faithfulness

This was the Reverend Edward Casaubon, noted in the county as a man of profound learning, understood for many years to be engaged on a great work concerning religious history; also as a man of wealth enough to give lustre to his piety, and having views of his own which were to be more clearly ascertained on the publication of his book.†
Chpt 1

Here was something beyond the shallows of ladies' school literature: here was a living Bossuet, whose work would reconcile complete knowledge with devoted piety; here was a modern Augustine who united the glories of doctor and saint.†
Chpt 1

At all events, it is certain that if any medical man had come to Middlemarch with the reputation of having very definite religious views, of being given to prayer, and of otherwise showing an active piety, there would have been a general presumption against his medical skill.†
Chpt 2

He was often invited to the Bulstrodes'; but the girls there were hardly out of the schoolroom; and Mrs. Bulstrode's naive way of conciliating piety and worldliness, the nothingness of this life and the desirability of cut glass, the consciousness at once of filthy rags and the best damask, was not a sufficient relief from the weight of her husband's invariable seriousness.†
Chpt 3

She believed in him as an excellent man whose piety carried a peculiar eminence in belonging to a layman, whose influence had turned her own mind toward seriousness, and whose share of perishable good had been the means of raising her own position.†
Chpt 6

He was quite aware of this; indeed in some respects he was rather afraid of this ingenuous wife, whose imitative piety and native worldliness were equally sincere, who had nothing to be ashamed of, and whom he had married out of a thorough inclination still subsisting.†
Chpt 6

Soon he became an intimate there, honored for his piety by the wife, marked out for his ability by the husband, whose wealth was due to a flourishing city and west-end trade.†
Chpt 6 *

A new Theresa will hardly have the opportunity of reforming a conventual life, any more than a new Antigone will spend her heroic piety in daring all for the sake of a brother's burial: the medium in which their ardent deeds took shape is forever gone.†
Chpt Fin.

The wife, a simple pious woman, left with all the wealth in and out of the magnificent trade, of which she never knew the precise nature, had come to believe in Bulstrode, and innocently adore him as women often adore their priest or "man-made" minister.†
Chpt 6

Definitions:

(1) (pious as in: a good, pious woman)
religious or highly moral
(2) (pious as in: a pious hypocrite)
self-righteous (acting as though one is, or believing one is highly moral when it is not true)
(3) (pious as in: cling to the pious hope)
(describing a hope or wish as) sincere, but highly unlikely
(4) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Much more rarely, piety can refer to devotion or faithfulness as Proust used it in the book, Swann's Way:

"...but when, as had befallen me, such an anguish possesses one's soul before Love has yet entered into one's life, then it must drift, awaiting Love's coming, vague and free, without precise attachment, at the disposal of one sentiment to-day, of another to-morrow, of filial piety or affection for a comrade."