sine

Spelling & Dictionary Insight

The English entry for sine is 4 letters long, classified as anoun, and transcribed in the International Phonetic Alphabet as /saɪn/. Corpus data places it at rank #25,577 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it.The dominant gloss from Wiktionary reads: "In a right triangle, the ratio of the length of the side opposite an angle to the length of the hypotenuse.".

Our Hunspell-derived misspelling index lists 5 documented wrong-spelling variants for sine, with forms such as "isne", "sien", and "sinne". 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, "six", "son", "sir", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: Borrowed from Latin sinus (“curve, bend; bosom”), a translation of Arabic جَيْب (jayb, “bosom”), a misidentification of the notation جيب (j-y-b), written without vowel diacritics, standing for Arabic جِيبَ (jība, “sine”), in turn from Sanskrit ज्या (jyā, “s… 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 sine, spelled S-I-N-E, and any other sequence of those letters, regardless of how natural it feels, is a misspelling in standard orthography.