zo·na·tion 
(zō-nāshən)
(zō-nāshən)n.
1. Arrangement or formation in zones; zonate structure.
2. Ecology The distribution of organisms in biogeographic zones.
- adventitial
- adventitious
- adventitiously
- adventitiousness
- adventive
- adventively
- Advent Sunday
- adventure
- adventurer
- adventuresome
- adventuresomely
- adventuresomeness
- adventuress
- adventurism
- adventurist
- adventuristic
- adventurous
- adventurously
- adventurousness
- adverb
- adverbial
- adverbially
- ad verbum
- adversarial
- adversary