intercommunicate comes from inter- ('between') + communicate, the latter from Latin communicatus, past participle of communicare ('to share, impart'), from communis ('common'). Morphologically, the prefixed shape matters: the initial element belongs to the recorded formation and helps explain the modern form's surface analysis. In present English, the verb sense is "to communicate mutually; to be connected so as to exchange information", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as communicate, intercommunion, and communication, and in derivatives such as intercommunication. Its semantic neighborhood includes interconnect, correspond, communicate, and interact, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Latin inter- and Latin communicare.