Any software performing either the final stage in a process, or a task not apparent to the user. A common usage is in a compiler. A compiler's back-end generates machine language and performs optimisations specific to the machine's architecture.
The term can also be used in the context of network applications. E.g. "The back-end of the system handles socket protocols".
Contrast front end.
We drap awa' like the leaves in the back-end, Maister Weelum—ay, juist like leaves nippit wi' the frost.
back-end, that portion of the year which commences with October.
It is no surprise to me who have commanded a body of clansmen for a fortnight in the back-end of a retreat.
"There'll be a good bit of money to come in this back-end," she said.
She went ben; and at that very moment, through the bit window in the back-end of the house, there came a ray of light.
"You can't pump water round the back-end," said the engineer.
The nights begin to be sharp with frost towards the back-end of the year, for all the days are sunny and warm at times.