Related Clues:

• Big bunch
• Wholesale
• Celebratory service
• Waist size
• See 20 Across
• The 'm' of E = mc squared
• Fathers celebrate it
• Market opening?
• Word with critical or Catholic
• Physics concept
• Weekly service
• Part of 'E=mc2'
• Measure in Newton's second law
• The "m" in E = mcВІ
• All embracing