Definition of read-mostly in English:

read-mostly

adjective

Computing
  • 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.

Origin

1970s; earliest use found in New Scientist. From read + mostly, after read-only.

Pronunciation

read-mostly

/ˌriːdˈməʊs(t)li/