nil·po·tent 
(nĭl-pōtnt, nĭlpōt′nt)
(nĭl-pōtnt, nĭlpōt′nt)n.
An algebraic quantity that when raised to a certain power equals zero.
[NIL + Latin potēns, potent-, having power; see POTENT.]
nil·poten·cy n.
- atrioventricular node
- atrip
- at-risk
- at risk
- atrium
- atrocious
- atrociously
- atrociousness
- atrocity
- atrophic
- atrophy
- atropin
- atropine
- Atropos
- ATSC
- at sea
- at service
- at sign
- Atsina
- at sixes and sevens
- at (someone's) beck and call
- at someone's beck and call
- at (someone's) door
- at someone's door
- at (someone's) feet