The phrase "perfectly interchangeable" is grammatically correct and commonly used in written English.
It means that two or more things can be substituted for each other without any changes or differences. Example: In this sentence, the words "happy" and "joyful" are perfectly interchangeable. Both words convey the same meaning and can be used interchangeably.
It is typical of this conundrum that, in the past century, the best Christian poet, W. H. Auden, and the greatest anti-Christian polemicist, William Empson, were exact contemporaries, close friends, and, as slovenly social types, almost perfectly interchangeable Englishmen.
He argues that for any such "open platform" exchange to work, "you need a truly fungible commodity, and you need liquidity".Unlike, say, treasury bills, he reckons electricity and gas are not perfectly interchangeable commodities: their prices vary wildly by geographical market, for example, and they can fluctuate every few seconds.
There is a general consensus arising from human studies of LV function that values obtained with different segmentation algorithms are not perfectly interchangeable but require scaling between methods [28].
Making amends in a television interview, Mr. Sarkozy praised Mr. Fillon's work as "perfectly remarkable," adding that the two of them are "interchangeable".
The unlimited amount of interchangeable pockets, inserts and custom compartments make this perfect for keeping everything you need perfectly organized and in one place.
Although the pyrimidine-ending codons are perfectly organized in the table, i.e., all U-ending and C-ending codons are interchangeable vertically without altering their encoded amino acids, the purine-ending codons have a couple of exceptions.
The episode stuck with me because it so perfectly embodied a kind of vintage racism, one in which all members of a particular racial group are entirely interchangeable; to respond with anger would be entirely beside the point.
The girls are interchangeable.
The components were interchangeable.
Their quotes are interchangeable.
