illusion

Spelling & Dictionary Insight

The English entry for illusion is 8 letters long, classified as anoun, and transcribed in the International Phonetic Alphabet as /ɪˈl(j)uːʒ(ə)n/. Corpus data places it at rank #7,803 in overall English word frequency, indicating it appears regularly in written and spoken text.Wiktionary records 4 distinct senses for this headword, so context determines which meaning a reader should apply.

Our Hunspell-derived misspelling index lists 10 documented wrong-spelling variants for illusion, with forms such as "illsuion", "illuison", and "illusino". Each variant represents a distinct typo pattern that appears often enough in corpora to be worth flagging, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution.It also participates in 2 confusable-pair relationships, "infusion", "inclusion", where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From Old French illusion, from Latin illūsiō, from illūdere, from in- (“at, upon”) + lūdere (“to play, mock, trick”). Displaced native Old English dwimmer. 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 illusion, spelled I-L-L-U-S-I-O-N, and any other sequence of those letters, regardless of how natural it feels, is a misspelling in standard orthography.