a·non 
(ə-nŏn)
(ə-nŏn)adv.
Idiom: 1. At another time; later.
2. In a short time; soon.
3. Archaic At once; forthwith.
ever/now and anon
Time after time; now and then.
[Middle English, at once, from Old English on ān : on, in; see ON + ān, one; see oi-no- in the Appendix of Indo-European roots.]