adj, name ·Rare ·Advanced level

Definitions

Adjective

1. 1
   Of a geologic period within the Mesoproterozoic era from about 1400 to 1200 million years ago.

Proper Noun

1. 1
   The Ectasian period.

Etymology

From Ancient Greek ἔκτασις (éktasis, “extension”) + -ian.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.