чергови́й

• adjective
• Level B2
• Rank 925 of 12,000
• 0.015% of running text

next

• noun
• Level C1
• Rank 11,769 of 12,000
• 0.001% of running text

person on duty

Meanings

1. regular (happening at constant intervals)
2. next (in an order or sequence)
3. duty (attributive), on duty (at work and responsible for doing a particular task)
4. regular (of a regular occurrence according to a schedule)

male

The dictionary keeps one entry for the spelling черговий, so these meanings cover every use above.