Dictionary.com
Thesaurus.com

inner space

British  

noun

  1. the environment beneath the surface of the sea

  2. the human mind regarded as being as unknown or as unfathomable as space

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

As a result, physicists were left with no theory of “quantum gravity” to explain what happened when the realms of inner space and outer space collided, as in the Big Bang or inside black holes.

From New York Times • Nov. 30, 2022

Borders “define an inner space in which one finds comfort and safety and for some, a sense of belonging.”

From Washington Post • May 7, 2020

During this sojourn into inner space, Queen Kane handily reveals her true reason for hunting a heretic roaming her lands.

From Salon • Nov. 5, 2019

It’s as if we feel affronted by the last wildernesses left to us – whether in outer or inner space.

From The Guardian • Jan. 29, 2018

He liked the loneliness of inner space, the sense of being forgotten by the world.

From "The Hot Zone" by Richard Preston