Definitions from Wiktionary (IO)

▸ noun:  A type of moth, the io moth.
▸ noun:  (Greek mythology) The daughter of Inachus river god, and a lover of Zeus, turned by the latter into a heifer.
▸ noun:  (astronomy) A moon of Jupiter, known for its volcanic activity, peppered with about 400 active volcanoes.
▸ noun:  (astronomy) 85 Io, a main belt asteroid; the asteroid shares its name with the Jovian moon
▸ noun:  (computing, electronics) Initialism of input and output.
▸ noun:  (grammar) Initialism of indirect object. [(grammar) A grammatical role of a ditransitive verb that manifests a secondary or passive participant in an action, often a recipient or goal.]
▸ noun:  Initialism of intelligence officer. [An employee of an organization who collects, compiles or analyzes information which is of use to that organization.]
▸ noun:  (Singapore, law enforcement) Initialism of investigation officer.
▸ noun:  (international law) Initialism of international organization. [(international law) An organisation established by a treaty or other instrument governed by international law and possessing its own international legal personality.]
▸ adjective:  (emergency medicine) Abbreviation of intraosseous. [(medicine) within a bone]

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