1. Going down by steps 
2. (of taxes) gradually decreasing in rate on sums below a certain amount

See also: descending, progressive

• implore
• imploring
• imploringly
• implosion
• implosion therapy
• implosive
• impluvium
• imply
• impolite
• impolitely
• impoliteness
• impolitic
• imponderable
• import
• import barrier
• import credit
• import duty
• importable
• importance
• important
• important person
• important-looking
• importantly
• importation
• imported