1917, Albert Bigelow Paine, “Mark Twain—A Biographical Summary” in Mark Twain’s Letters, New York: Gabriel Wells, 1923, Volume I, p. 16,
[…] he declared he would travel to Mars and back, if necessary, to get that Oxford degree. He appreciated its full meaning—recognition by the world’s foremost institution of learning of the achievements of one who had no learning of the institutionary kind.
Containing the first principles or doctrines; rudimentary.
1772, Review of Macbride’s Introduction to the Theory and Practice of Physic, The Monthly Review, Volume 47, November 1772, p. 381,
The first or institutionary part, which is divided into seven books, explains the principles on which the art is founded, and may be read with pleasure even by those who would wish only to be acquainted with the theory of medicine, considered as a curious and interesting branch of natural philosophy.