li·ai·son (lē-āzŏn′, lēā-)
a. An instance or a means of communication between different groups or units of an organization, especially in the armed forces.
b. One that maintains communication: served as the president's liaison with Congress.
2. A sexual relationship, especially when at least one person is married or involved in a sexual relationship with someone else.
3. Linguistics Pronunciation of the usually silent final consonant of a word when followed by a word beginning with a vowel, especially in French.
intr.v. li·a·soned, li·a·son·ing, li·a·sons
To serve as a liaison.
[French, from Old French, from Latin ligātiō, ligātiōn-, from ligātus, past participle of ligāre, to bind; see LIGATE.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.