In French, liaison is the pronunciation of a linking consonant between two words in an appropriate phonetic and syntactic context. Wikipedia

The pronunciation of a word-final consonant due to a following vowel sound in French Wikipedia Disambiguation

Pronunciation of a latent word-final consonant immediately before a following vowel sound Wikidata

The phonological fusion of two consecutive words and the manner in which this occurs, for example intrusion, consonant-vowel linking, etc. In the context of some languages, such as French, liaison can refer specifically to a normally silent final consonant, being pronounced when the next word begins with a vowel, and can often also include the intrusion of a "t" in certain fixed chunks of language such as the question form "pense-t-il". Wiktionary