This is the 461st most frequent French word.
domaine
"Field," "area," or "domain" of expertise, activity, or ownership.
In this sentence, 'domaine' refers to an area of expertise or academic field.
Le domaine des sciences est très vaste.
The field of sciences is very vast.
Here, 'domaine' denotes a landed estate, specifically one used for cultivating wine.
Nous avons visité un beau domaine viticole en France.
We visited a beautiful vineyard estate in France.
In this context, 'domaine' is used metaphorically to describe someone's range of abilities or knowledge.