noun, plural in·ter·me·di·ar·ies.

an intermediate agent or agency; a go-between or mediator.
a medium or means.
an intermediate form or stage.


being between; intermediate.
acting between persons, parties, etc.; serving as an intermediate agent or agency: an intermediary power.

Origin of intermediary

1785–95; < Late Latin intermedi(um) intervening place + -ary; see intermediate1

Synonyms for intermediary Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for intermediary


noun plural -aries

a person who acts as a mediator or agent between parties
something that acts as a medium or means
an intermediate state or period


acting as an intermediary
situated, acting, or coming between; intermediate
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

Word Origin and History for intermediary

1788 (adj.); 1791 (n.), from French intermédiaire (17c.), from Medieval Latin intermedium, from Latin intermedius (see intermediate).

Online Etymology Dictionary, © 2010 Douglas Harper