subordination (n.)

• assortment
• categorization
• continuity
• culling
• degree
• gradation
• grouping
• hierarchy
• humbleness
• humility
• inferiority
• lowliness
• minority
• place
• placement
• rank
• ranking
• screening
• selection
• sequence
• service
• servility
• sifting
• sorting
• subjection
• subservience
• taxonomy
• triage