If a place or object is enclosed by something, the place or object is inside that thing or completely surrounded by it. The rules state that samples must be enclosed in two watertight containers Enclose the pot in a clear polythene bag the enclosed waters of the Baltic
If you enclose something with a letter, you put it in the same envelope as the letter. I have enclosed a cheque for £10 The enclosed leaflet shows how Service Care can ease all your worries