We've found 3 phrases for mainly (0.194 seconds):

noarch »    Short for "no architecture". It is a term used mainly in package management systems to mark packages which are architecture independent. Such packages usually contain graphics, documentation or similar data that can be used on any architecture.

pencil pusher »    One who does routine office work; someone involved mainly in paperwork.

rush hour »    The times of the day when traffic jams are commonplace, due mainly to people commuting to or from work.

BTW, Why won't you become an editor?