Related Clues:

• Easter liturgy
• RC ceremony
• 'Critical' measurement
• Every object has it
• Pile of characters stuffed into melodrama's storylines
• Papal ceremony
• Billiards shot, and an anagram of 87 Down
• The 'm' in the equation 'F = ma'
• Einstein's "m"
• Einstein's 'm'
• The "m" of E = mc2
• Harvard U.'s state
• Is curate upset about the beginning of Holy Sacrament?
• Come together for religious service
• Critical ___