Webster's Revised Unabridged Dictionary · 1913

liaison

liaison (le`a`zôN") , noun

[French, from Latin ligatio, from ligare to bind. See Ligature, and compare Ligation.]

1.
A union, or bond of union; an intimacy; an interrelationship.
2.
An illicit sexual relation between a man and a woman; a sexual afffair.
3.
A process of communication between parts of an organization or between two organizations acting together for a common purpose.
4.
A person whose function it is to maintain such communication.
5.
(Phonetics) A pronunciation of a consonant sound that would be otherwise silent, such as the final consonant of certain French words, when the following word begins with a vowel sound.