TOEFL IELTS air Definition The invisible gaseous substance that surrounds the Earth Example "We need oxygen-rich air to breathe." Sign in to save TOEFL Quiz → IELTS Quiz → ← aim airborne → Study tips featuring "air" Audit Your Own Writing to Find Gaps TOEFL Academic Vocabulary: Study by Topic Boost Your IELTS Writing With Precise Vocabulary Related words TOEFL swiftness GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate GRE abduct SAT abet GRE abhor GRE abide SAT abject TOEFL ablaze