This is the 2781st most frequent Russian word.
начиная
"Starting" or "beginning."
Here, 'начиная' is used to introduce the starting point of an activity or a discussion.
Мы изучили целую эпоху истории начиная с древнеримских времен.
We studied an entire era of history starting from ancient Roman times.
In this sentence, 'начиная' indicates the point in time when a continuous action began.
Начиная с утра, она готовила все для праздника.
Starting from the morning, she prepared everything for the celebration.
Here, 'начиная' is used to specify the commencing element in a list or range of topics.