This is the 107th most frequent Romanian word.
acestea
"Acestea" means "these" in English.
In this sentence, 'acestea' is a demonstrative pronoun used to refer to feminine plural nouns in the nominative or accusative case.
Acestea sunt cărțile pe care le-am citit.
These are the books that I have read.
In this example, 'acestea' is used as a demonstrative pronoun to directly refer to a previously mentioned group of feminine plural items.
Îmi plac acestea deoarece sunt foarte confortabile.
I like these because they are very comfortable.
Here, 'acestea' is a demonstrative pronoun in feminine plural form, referencing previous feminine plural entities in a conversation.