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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

abstraction, abstract entity go
a general concept formed by extracting common features from specific examples

communication go
something that is communicated by or to or between people or groups

message go
a communication (usually brief) that is written or spoken or signaled

mail
the bags of letters and packages that are transported by the postal service

noun.communication

10 Subcategories

first class, 1st class, first-class mail, 1st-class mail go
mail that includes letters and postcards and packages sealed against inspection
express, express mail go
mail that is distributed by a rapid and efficient system
parcel post go
postal service that handles packages
bulk mail go
mail consisting of large numbers of identical items (circulars or advertisements) sent to individual addresses at less than 1st-class rates and paid for in one lot
third class, third-class mail go
mail consisting of printed matter qualifying for reduced postal rates
airmail go
letters and packages that are transported by aircraft
air mail go
mail that is sent by air transport
surface mail go
mail that is sent by land or sea
registered mail, registered post go
mail that is registered by the post office when sent in order to assure safe delivery
special delivery go
mail that is delivered by a special carrier (for an additional charge)