# ultrabook

> English word · Noun · frequency rank #86,886

## Definitions
1. A very lightweight and thin portable computer the areal size of a notebook computer or subnotebook.

## Etymology
From ultra- + book; see notebook computer.

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