Related Clues:

• Part of the relativity equation
• Considerable number
• Fathers lead it
• Type of appeal
• Steven Chu's cabinet department
• The pope may lead it
• Sunday ritual, for many
• What some bars supply
• E for Einstein
• Power or vigour.
• Capacity for action
• Power or vigorous activity
• Vigour or power
• Vigour, animation
• Capacity for activity