# interplanetary

/ˌɪntɝˈpɫænəˌtɛɹi/ (US) · /ˌɪntəplˈænɪtəɹi/ (UK) · CEFR B2 · Adjective

Source: https://englishreference.com/word/interplanetary
Updated: 2026-05-25

## Definition

relating to travel or communication between different planets. You use this to describe things that move or exist in space between worlds.

For teachers: relating to or occurring between planets. Typically describes travel, communication, or phenomena that span the space between celestial bodies.

## Examples

- The probe is designed for interplanetary travel.
- Scientists are developing new propulsion systems to make interplanetary missions faster and more efficient.
- The discovery of microbial fossils in Martian soil would represent the first evidence of interplanetary contamination, fundamentally altering our understanding of the origins of life in the solar system.

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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.