Definitions
1.noun(sometimes hyphenated when used attributively) A kind of postal service in which, for an extra fee, letters and packages are delivered in a highly expedited manner by a special courier.
2.nounA particular posted letter or package which is delivered in this manner; a particular act of conveying such letters or packages to one or more recipients.
3.noun(by extension, sometimes humorous) Something—whether desirable or undesirable—which is intentionally given to a specific individual or which an individual receives rapidly and unexpectedly; the personalized, direct quality of the transmission of such an item.