This is the 8953rd most frequent French word.
chaine
Chain; channel; sequence.
In this sentence, 'chaîne' refers to jewelry, specifically a silver chain.
Il a perdu sa chaîne en argent hier.
He lost his silver chain yesterday.
Here, 'chaîne' denotes a sequence or range, in this case, a mountain range.
La chaîne de montagnes traverse plusieurs pays.
The mountain range crosses several countries.
In this context, 'chaîne' is used to mean a television channel.