年功 (ねんこう, nenkou) Japanese meaning: long service | KotomoraHe was promoted based on seniority.
Some companies still have a seniority-based system.
Usage patterns
年功を積むto build up seniority through years of service
He has built up seniority at this company over many years.
年功に応じて〈物〉が上がるfor something (pay, rank) to rise according to seniority
At this company, salaries rise according to seniority.