eon

• 名词，指极其漫长、难以计量的时间段；在地质学中特指地质年代分期的最大单位“宙”。

A noun referring to an extremely long, indefinite period of time, often used in geology to denote the largest division of the geological time scale, or in general contexts to describe an immeasurably long duration.

1. Longest geological time unitC1formalscientific

   The most extensive division of geological time, spanning hundreds of millions of years.

   宙

   • The Precambrian eon covers the earliest history of Earth.
   • Scientists study rock formations from the Paleozoic eon.
   • The planet has undergone dramatic changes throughout each eon.
   • Fossil records from the Phanerozoic eon reveal diverse life forms.

   同义词aeon

2. Immensely long periodB2informal

   A vast, indefinite stretch of time that seems almost endless.

   万古

   • I waited for what felt like an eon for the bus to arrive.
   • Stars burn for eons before eventually dying out.
   • The stones have been weathered over countless eons.
   • He hasn't visited this place in eons.

   同义词aeonageepocheraeternityforeverlong time

   反义词instantmomentsplit second

3. Divine emanation (Gnosticism)C2formal

   In Gnostic belief, a spiritual being or power that originates from the Supreme God and helps govern the universe.

   神圣流溢（诺斯底主义）

   • The Gnostic texts describe various aeons that emanate from the divine source.
   • Each aeon represents a different aspect of the ultimate reality.
   • The myth of Sophia is central to understanding the role of aeons.
   • Valentinian cosmology includes a hierarchy of thirty aeons.

   同义词aeonemanation