Webster's English Dictionary

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liaison

li.ai.son \'le--*-.za:n, le--'a--\ n [F, fr. MF, fr. lier] often attrib  
   1a: a close bond or connection : INTERRELATIONSHIP  1b: an illicit sexual 
   relationship : AFFAIR  2: the pronunciation of an otherwise absent 
   consonant sound at the end of t he first of two consecutive words the 
   second of which begins with a vowel sound and follows without pause 3: 
   intercommunication esp. between parts of an armed force