This is the 3421st most frequent Russian word.
председательства
"Председательства" means "chairmanship" or "presidency" (the act of presiding over a meeting, organization, or body).
In this sentence, 'председательства' refers to the position or role of someone acting as the chairman of a committee.
Период его председательства в комитете был ознаменован значительными изменениями.
The period of his chairmanship in the committee was marked by significant changes.
Here, 'председательством' emphasizes the leadership or guidance provided by the renowned scientist at the event.
Конференция прошла под председательством известного учёного.
The conference was held under the chairmanship of a renowned scientist.
The word 'председательства' denotes the term or tenure when she was the chairperson of the organization.