Where does “cosine” come from?
Cosine comes from English sine, from Latin co- prefixed to a word from Arabic جَيْب meaning "pocket" or "fold," ultimately from Proto-Indo-European roots related to bending or folding.
cosine (English): In a right triangle, the ratio of the length of...
Definitions
- In a right triangle, the ratio of the length of...
Ancestry of “cosine”, step by step
| Step | Language | Word | Meaning |
|---|---|---|---|
| 1 | English | co- | together; mutually; jointly; partner or... |
| 2 | Latin | co- | allomorph of con- |
| 3 | Latin | cōn- | Used in compounds to indicate a being or bringing together of several objects |
| 4 | Latin | cum | with, along with; at; -fold |
| 5 | Old Latin | com | Alternative form of cum |
| 6 | Proto-Italic | kom | with, along, at |
| 7 | Proto-Indo-European | ḱóm | beside, near, by, with |
| 8 | Proto-Indo-European | ḱe | Deictic particle, here; Post-positional... |
| 9 | Middle English | kyt | — |
| 10 | German | kitt | putty certain kinds of cement used for fixing e.g. window panes |
| 11 | Old High German | kuti | — |
| 12 | Proto-West Germanic | kwidu | gum, resin |
| 13 | Proto-Germanic | kweduz | resin |
| 14 | Proto-Indo-European | gʷet- | resin, gum; to say, speak |
| 15 | Proto-Indo-European | gū- | to bend; curve; arch; vault; to bow, bend, arch,... |