1. Increasing by successive addition
   "the eventual accumulative effect of these substances"
   - cumulative 
2. Marked by acquiring or amassing
   "we live in an accumulative society"

See also: accumulate, acquisitive, additive

• Masefield
• maser
• Maseru
• mash
• mashed potato
• masher
• Mashhad
• Mashi
• mashie
• mashie niblick
• Mashriq
• mashup
• masjid
• mask
• mask of pregnancy
• masked
• masked ball
• masked shrew
• masker
• masking
• masking paper
• masking piece
• masking tape
• masochism
• masochist