This is the 8484th most frequent Russian word.
неслучайно
"Not by chance" or "not accidentally."
Here, 'неслучайно' emphasizes that the action (choosing the book) was deliberate and purposeful, not coincidental.
Неслучайно он выбрал эту книгу для чтения.
It is not a coincidence that he chose this book to read.
In this sentence, 'неслучайно' highlights that the placement of the painting was intentional, emphasizing purposeful arrangement.
Эта картина неслучайно была помещена в центр зала.
This painting was deliberately placed at the center of the hall.
The word 'неслучайно' indicates that the teacher focuses on the topic purposefully, based on its importance or relevance.