1. Capable of being ascended
   - ascendable, ascendible 
2. Capable of being surmounted
   - surmountable

See also: passable, scalable

• ab initio
• ab ovo
• aba
• ABA transit number
• abaca
• abacinate
• aback
• abactinal
• abacus
• Abadan
• Abaddon
• abaft
• abalone
• abamp
• abampere
• abandon
• abandoned
• abandoned infant
• abandoned person
• abandoned ship
• abandonment
• abandonware
• abarticulation
• abase
• abasement