English Reference

Word

terrestrial

Phoneticster·res·tri·al, stress on the second syllable

US/tɝˈɛstɹiəɫ/

UK/təɹˈɛstɹɪəl/

Definitions

01relating to planet Earth

C1 · Advanced Science Academic

adj. relating to the planet Earth rather than other planets or space.

adj. pertaining to the planet Earth as a physical or astronomical entity.

“Scientists are looking for terrestrial planets that might support life like ours.”

“The probe was designed to measure terrestrial magnetism before exiting the atmosphere to study the solar wind.”

Usage

Usually placed before the noun.

Synonyms

02living on land

C1 · Advanced Science Technical

adj. living or growing on land instead of in water or in the air.

adj. living or growing on the ground or in soil as opposed to being aquatic, arboreal, or epiphytic.

“The island is home to several unique terrestrial birds that cannot fly.”

“The study compares the metabolic rates of aquatic mammals with those of their terrestrial relatives to understand heat conservation.”

Usage

Commonly used in biology and ecology.

Synonyms

land-basedground-dwelling

Antonyms

03ground-based broadcasting

B2 · Upper Intermediate Computing British English

adj. describing television or radio signals sent from the ground rather than by satellite.

adj. relating to the transmission of television or radio signals via ground-based stations rather than satellite or cable.

“You don't need a satellite dish to watch terrestrial television.”

“The government announced a plan to switch off the old terrestrial signal in favour of a fully digital network.”

Usage

Often used in the context of media and telecommunications.

Synonyms

over-the-airbroadcast

Antonyms

04an inhabitant of Earth

C2 · Proficiency Countable noun Humorous · Literary

n. a person or creature that lives on the planet Earth.

n. an inhabitant of the planet Earth, often used in contrast to hypothetical aliens.

“In the movie, the aliens were surprised by the strange habits of terrestrials.”

“The novelist explores the philosophical implications of a first contact between advanced civilizations and unsuspecting terrestrials.”

Synonyms

earthlinghuman

Real-World Examples

“A wide range of predators hunted on the lake's shores, including anacondas, saber-toothed mammals, flightless "terror birds" and sebecids—terrestrial relatives of crocodylians.”
Phys.org 17 Aug 2026
“This beetle feeds primarily on terrestrial snails and has diversified into eight subspecies.”
Phys.org 17 Aug 2026
“Analyses could distinguish whether Mars’s moons formed from a giant impact or captured asteroids, informing models of volatile and organic-material delivery to terrestrial planets.”
Phys.org 16 Aug 2026
“Had it bypassed “all the terrestrial stages of development – that is to say, the emergence of protozoa and metazoa, plant and animal evolution” – yet still managed to become intelligent?”
The Guardian 11 Aug 2026

Etymology

From Middle English terrestrialle, from terrestre or Latin terrestris, from terra (“land, earth, ground”), with the suffix -al.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Domains

AstronomyBotany

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.C1 AdvancedIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.7.0–8.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 5.0–5.595–113TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.945–990
Frequency
Frequent
Level
C1 · Advanced
Updated

QR code

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English Reference