One of the mysteries of the English language finally explained.
Designating a memory whose contents can be changed, though not by program instructions, but which is designed on the basis that such changes will be very infrequent compared with the number of occasions when the contents are read.
1970s; earliest use found in New Scientist. From read + mostly, after read-only.
In this article we explore how to impress employers with a spot-on CV.