# NII

> English word · Noun · frequency rank #54,970

## Definitions
1. A Soviet scientific research institute.

## Etymology
Borrowed from Russian НИИ (NII).

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