Collins Chinese Dictionary Plus (3rd edition), 2011:
先后(後) xiānhòu
I 名
- 公司晋(晉)升不分先后(後),只凭(憑)个(個)人能力。 Gōngsī jìnshēng bù fēn xiānhòu,zhǐ píng gèrén nénglì. The company makes no distinction as to seniority but promotes people on the basis of ability.
II 副
successively