ultrabook
noun
ultrabook is a noun meaning “A very lightweight and thin portable computer the areal size of a notebook computer or subnotebook” (English Wiktionary, September 2026). It is spelled U-L-T-R-A-B-O-O-K, and it appears about once in every 8 million words in written English (wordfreq, 2021 data). The plural of ultrabook is ultrabooks.
What does ultrabook mean?
noun
- 1
A very lightweight and thin portable computer the areal size of a notebook computer or subnotebook.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Forms of ultrabook
- ultrabooks plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is ultrabook?
Ultrabook appears about once in every 8 million words in written English, the 86,301st most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Where does ultrabook come from?
From ultra- + book; see notebook computer.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).