# SAO

/ˈsaʊ/ (US)

Source: https://englishreference.com/word/sao
Updated: 2026-08-08

## Senses

### 1. astronomy catalog

noun · CEFR C2 · Technical

Stands for Smithsonian Astrophysical Observatory; often refers to a famous catalog of stars.

For teachers: Abbreviation for Smithsonian Astrophysical Observatory; specifically used to refer to the SAO Star Catalog, a standard reference in astrometry.

- The astronomer looked up the star's coordinates in the SAO catalog.
- The SAO Star Catalog remains a foundational resource for identifying stellar positions, despite being superseded by more modern satellite-based datasets.

### 2. moon of Neptune

noun · CEFR C2 · Technical

a small, distant moon that orbits the planet Neptune.

For teachers: a prograde irregular satellite of Neptune, discovered in 2002 and named after a Nereid from Greek mythology.

- Sao is one of the smaller moons orbiting far away from Neptune.
- Due to its small size and extreme distance from the planet, Sao is difficult to observe without high-powered telescopic equipment.

### 3. anime series

noun · CEFR B2 · Informal

Stands for Sword Art Online; a famous Japanese light novel and animation series about virtual reality.

For teachers: Abbreviation for Sword Art Online; a highly influential Japanese media franchise centered on characters trapped within a virtual reality MMORPG.

- Many fans of Japanese animation have watched SAO on streaming platforms.
- The success of SAO is often credited with popularizing the 'isekai' genre, where protagonists are transported to another world or digital reality.

### 4. disc recording mode

noun · CEFR C2 · Technical

Stands for session-at-once; a way of recording data onto a CD or DVD in one go.

For teachers: Abbreviation for session-at-once; a recording mode for optical discs where the laser records the entire session without interruption.

- You should use SAO mode if you want to make a high-quality audio CD.
- Recording in SAO mode ensures that no gaps are introduced between tracks, which is essential for professional-grade audio mastering on optical media.

## Examples

- The old sao shared his wisdom with the village.
- In ancient texts, the sao was often consulted by kings before they made major decisions regarding the law.
- The manuscript refers to the sao not merely as a transmitter of facts, but as a spiritual guide whose authority was unquestioned within the academic community of the era.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.