sigma

Spelling & Dictionary Insight

The English entry for sigma is 5 letters long, classified as anoun, and transcribed in the International Phonetic Alphabet as /ˈsɪɡmə/. Corpus data places it at rank #14,835 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it.Wiktionary records 4 distinct senses for this headword, so context determines which meaning a reader should apply.

Our Hunspell-derived misspelling index lists 7 documented wrong-spelling variants for sigma, with forms such as "isgma", "sgima", and "sigam". 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 20 confusable-pair relationships, "SIM", "SMA", "sign", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From Ancient Greek σῖγμα (sîgma), probably from the root σῑγ- (sīg-) as seen in σίζω (sízō, “to hiss”) + -μα (-ma, nominal suffix). 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 sigma, spelled S-I-G-M-A, and any other sequence of those letters, regardless of how natural it feels, is a misspelling in standard orthography.