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Definitions

OS

[os] / ɒs /
NOUN
disk operating system
Synonyms
WEAK
dos operating system system software
NOUN
operating system
Synonyms
WEAK
MS-DOS MacOS OS/2 UNIX Windows disk operating system dos executive system software systems program
NOUN
systems program
Synonyms
WEAK
I/O routine command-line interpreter disk operating system memory-management routine operating system task scheduling user interface

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A new Longevity Preparedness Index from John Hancock and MIT AgeLab os based on a survey of over 1,300 adults and focused on eight areas such as finance, home, health and community.

From MarketWatch • Dec. 12, 2025

She first broke through with 2016’s “Remonta,” an album she recorded with her former band Liniker e os Caramelows.

From Los Angeles Times • Oct. 8, 2025

Outras hidrelétricas amazônicas têm impactos semelhantes sobre os igapós.

From Science Magazine • Jan. 5, 2023

De todos os peixes da região, sete espécies de pacu são as mais importantes para sua comunidade, que depende principalmente da pesca para subsistência.

From Science Magazine • Jan. 5, 2023

Newton disliked infinitesimals, the little os in his fluxion equations that sometimes acted like zeros and sometimes like nonzero numbers.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife

Vocabulary lists containing OS

Scrabble: Two-Letter Words

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