accustom

Etymology

From Old French acoustumer, acustumer (Modern French accoutumer) corresponding to a (“to, toward”) + custom. More at custom, costume.

verb

1. (transitive, often passive or reflexive, with to) To make familiar by use; to cause to accept; to habituate, familiarize, or inure.
   Early exposure to pet allergens and pet-related bacteria accustoms the body to allergens.
   I shall always fear that he who accustoms himself to fraud in little things, wants only opportunity to practice it in greater. c. 1753, John Hawkesworth et al., Adventurer
   Although it might be thought that drivers would naturally refer constantly to the speedometer, older drivers who come to diesel driving after years of steam experience without the help of speedometers, as well as those on steam engines which have been equipped with speedometers in recent years, have not accustomed themselves to the constant use of this instrument. 1962 December, “Talking of Trains: Derailment at Lincoln”, in Modern Railways, page 375
   He took it [a television] back to his unfurnished room and began watching as much as he could, including Ms. Winfrey’s show, to accustom his ear to hearing English. March 11, 2011, Larry Rohter, “CNN’s Latin Sister Looks to Capture a Booming Market”, in The New York Times
   […] creating 3D graphics “is a fundamental building block” to popularizing AR because it helps accustom the general public to interacting with 3D content. May 31, 2017, Jonathan Vanian, “How Microsoft Is Sowing the Seeds of an Augmented Reality Future”, in Fortune
2. (intransitive, obsolete) To be wont.
3. (intransitive, obsolete) To cohabit.

noun

1. (obsolete) Custom.