read (oneself) in

Of a priest in the Anglican church, to assume possession of a benefice (a church office with fixed capital assets and subsequent revenue) by reading the Thirty-nine Articles of Religion and declaring his assent. Primarily heard in UK. A new priest must read himself in within two months of being ordained in order to be granted his new office.

Of a computer, to acquire data from something, such as a program, and enter it into memory or storage. A noun or pronoun can be used between "read" and "in." The command triggers the operating system to allocate virtual memory so that it can read the program in.

to read something in particular in a some publication or document. I read an interesting article about moose in today's newspaper. Did you read that in today's newspaper?