# Ectasian

> English word · Adjective

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

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/ectasian