This is the 12526th most frequent Russian word.
коллекцию
"Collection."
Here, 'коллекцию' refers to the collection of books owned by the speaker, demonstrating its usage in the possessive sense to denote accumulation.
Я добавил новую книгу в свою коллекцию.
I added a new book to my collection.
In this sentence, 'коллекцию' describes a curated group of artworks displayed in an exhibition, emphasizing its contextual meaning in an organized display.
Эта выставка представила уникальную коллекцию произведений искусства.
This exhibition presented a unique collection of artworks.
'Коллекцию' here serves as the object of the verb, indicating the accumulated items (vintage coins) being collected since childhood, showing its broad usage for gathered items.