c. 1300, avauncement, "a raising to a higher rank," also "promotion, assistance," from Old French avancement "advancement; profit, advance payment," from avancir "move forward" (see advance (v.)). Meaning "act of helping to move something forward" is from 1550s. The unetymological -d- is from 16c.
advancement of knowledge
adulthood
adumbrate
adumbration
advance
advanced
advancement
advantage
advantageous
advent
Adventist
adventitious