# OSI

> English word · Proper noun · frequency rank #39,943

## Definitions
1. Initialism of Open Systems Interconnection, an International Standard ISO/IEC 7894:1994(E) subtitled Basic Reference Model, containing a formal description of an idealized computer network architecture.
2. Initialism of Other Supplementary Information, a message sent to an airline by an agent, in a standardised format, advising relevant information such as being a VIP, language difficulty, or passport information.
3. Initialism of Open Source Initiative.
4. Initialism of Office of Special Investigations.

## Easily confused with
- **oz** (https://plainspell.com/en/vs/osi-vs-oz)
- **OT** (https://plainspell.com/en/vs/osi-vs-ot)
- **ou** (https://plainspell.com/en/vs/osi-vs-ou)
- **ow** (https://plainspell.com/en/vs/osi-vs-ow)
- **ox** (https://plainspell.com/en/vs/osi-vs-ox)
- **oy** (https://plainspell.com/en/vs/osi-vs-oy)
- **ov** (https://plainspell.com/en/vs/osi-vs-ov)
- **out** (https://plainspell.com/en/vs/osi-vs-out)
- **our** (https://plainspell.com/en/vs/osi-vs-our)
- **own** (https://plainspell.com/en/vs/osi-vs-own)
- **owe** (https://plainspell.com/en/vs/osi-vs-owe)
- **owl** (https://plainspell.com/en/vs/osi-vs-owl)
- **OST** (https://plainspell.com/en/vs/osi-vs-ost)
- **ova** (https://plainspell.com/en/vs/osi-vs-ova)
- **OTC** (https://plainspell.com/en/vs/osi-vs-otc)
- **OTT** (https://plainspell.com/en/vs/osi-vs-ott)
- **oss** (https://plainspell.com/en/vs/osi-vs-oss)
- **Ota** (https://plainspell.com/en/vs/osi-vs-ota)
- **oth** (https://plainspell.com/en/vs/osi-vs-oth)
- **oui** (https://plainspell.com/en/vs/osi-vs-oui)

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/osi