(idiomatic) The same person or thing. Used to emphasize the identity or equivalence of two things.
Are the beautiful and the good one and the same? / Indeed, they are one and the same thing.
It's almost like there's one electron in two places at one and the same time.
One-and-the-same Sentence Examples
Maybe they're one and the same.
This consists of a receiving antenna similar to the sending antenna, and in any wireless telegraph station it is usual to make the one and the same antenna do duty as a receiver or sender by switching it over from one apparatus to the other.
Literature and affairs, science and statecraft, poetry and medicine, these various expressions of human nature and activity were so harmoniously balanced that they might be found in the possession of one and the same individual.
There was hardly any regular succession to the throne; and Jerusalem, as Stubbs writes, "suffered from the weakness of hereditary right and the jealousies of the elective system" at one and the same time.
The masses of different elements which combine separately with one and the same mass of another element, are either the same as, or simple multiples of, the masses of these different elements which combine with each other.