This is the 12936th most frequent Russian word.
лидере
"Лидере" is the prepositional case form of "лидер," meaning "leader" in English.
The word 'лидере' is used in its genitive case form 'лидером', referring to someone who leads or is at the forefront in a social or hierarchical context.
Он всегда мечтал быть лидером своего класса.
He always dreamed of being the leader of his class.
Here, 'лидере' (used as 'лидера') means an individual who guides or influences others in a professional context.
В нашей компании успех зависит от хорошего лидера.
In our company, success depends on a good leader.
In this sentence, 'лидере' (in the phrase 'шел в лидерах') describes a person who is in the leading position, metaphorically applicable in a competitive environment.