This is the 17119th most frequent Russian word.
стажа
"Стажа" refers to work experience or length of service.
The word 'стажа' here refers to professional experience, specifically the number of years someone has worked in a particular field.
У него двадцать лет стажа в преподавании.
He has twenty years of experience in teaching.
'Стажа' denotes the accumulated work experience necessary to qualify for the license.
Для получения этой лицензии требуется минимум пять лет стажа.
To obtain this license, a minimum of five years of experience is required.
In this sentence, 'стажа' represents the practical work experience obtained after completing education.