simple past tense and past participle of enclose
"The builder enclosed the yard with a tall fence last summer."
In plain English: To enclose something means to put it inside an area so that nothing can get out and no outside things can come in.
"The letter was enclosed in an envelope with his name on it."
closed in or surrounded or included within
"an enclosed porch"
"an enclosed yard"
"the enclosed check is to cover shipping and handling"
Contained; held within a container.
"The small stone was enclosed in a clear plastic bag before being mailed to me."
In plain English: Enclosed means something is completely surrounded by walls, fences, or other barriers so nothing can get in or out easily.
"The house has an enclosed garden surrounded by tall hedges."