# symbiotic

/ˌsɪmbiˈɑtɪk/ (US) · /sˌɪmbaɪˈɒtɪk/ (UK) · CEFR C1 · Adjective

Source: https://englishreference.com/word/symbiotic
Updated: 2026-05-19

## Definition

describing a relationship where two different things or people depend on each other to survive or succeed. In space, it often means two stars or planets that share the same orbit and energy.

For teachers: describing a relationship between two organisms or entities that benefits both parties. In an astronomical context, it refers to a binary star system or planetary configuration where the bodies are mutually dependent for stability.

## Examples

- The two stars form a symbiotic system.
- Astronomers observed a symbiotic relationship between the two planets, where their gravitational pull kept both in a stable orbit.
- The symbiotic nature of the binary star system allows both stars to exchange material, preventing either from collapsing under its own gravity for millions of years.

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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.