ion

Spelling & Dictionary Insight

The English entry for ion is 3 letters long, classified as anoun, and transcribed in the International Phonetic Alphabet as /ˈaɪən/. Corpus data places it at rank #5,604 in overall English word frequency, indicating it appears regularly in written and spoken text.The dominant gloss from Wiktionary reads: "An atom or group of atoms bearing an electrical charge, such as the sodium and chlorine atoms in a salt solution.".

No frequent misspelling variants are recorded for ion in our index, suggesting the orthography either follows predictable English patterns or the word is uncommon enough that typo corpora lack signal.It also participates in 20 confusable-pair relationships, "is", "it", "IV", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From the ending of anion and cation, which in turn is from Ancient Greek ἰόν (ión, “going”), neuter present participle of εἶμι (eîmi, “I go”). Coined by English polymath William Whewell in 1834 for Michael Faraday, who introduced it later that year. Root origin matters for spelling because borrowed morphemes (Greek, Latin, Old French, Old English) carry their source-language orthographic conventions into modern English, which is why historical etymology is often the cleanest predictor of whether a cluster like "-ough", "-eau", or "-tion" will appear. For readers arriving here from a spelling check, the authoritative guidance is: the correct English form is ion, spelled I-O-N, and any other sequence of those letters, regardless of how natural it feels, is a misspelling in standard orthography.