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ionosphere

noun

Simple meaning

The upper part of the air around Earth.

Pronunciation

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eyeahnawsfir

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IPA pronunciation (US)

aɪˈɑnɔsfɪɹ

This word is pronounced essentially the same in American and British English, so one transcription covers both.

IPA (International Phonetic Alphabet) is a standard way of writing speech sounds.

Word Review

Definition

Everyday modern meanings first, grouped by part of speech.

noun

  1. The outer region of the Earth's atmosphere; contains a high concentration of free electrons

  2. The part of the Earth's atmosphere beginning at an altitude of about 50 kilometers (31 miles) and extending outward 500 kilometers (310 miles) or more.

  3. The similar region of the atmosphere of another planet.

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Dictionary data from Wiktionary via the Free Dictionary API. Simple meanings, combinations and word intelligence are built from verified reference data, no AI is used to load this page.