What's the difference between i.e. and e.g.?
late 14c., from Latin zona "geographical belt, celestial zone," from Greek zone "a belt," related to zonnynai "to gird," from PIE root *yes- "to gird, girdle" (cf. Avestan yasta- "girt," Lithuanian juosiu "to gird," Old Church Slavonic po-jasu "girdle").
Originally one of the five great divisions of the earth's surface (torrid, temperate, frigid; separated by tropics of Cancer and Capricorn and Arctic and Antarctic circles); meaning "any discrete region" is first recorded 1822. Zone defense in team sports is recorded from 1927. Zoning "land-use planning" is recorded from 1912. Zoned (adj.) in drug-use sense is attested 1960s, from ozone, which is found high in the atmosphere; the related verb to zone is from 1980s.
An area or a region distinguished from adjacent parts by a distinctive feature or characteristic.
(also zoner) A person intoxicated with narcotics, esp habitually so; space cadet (1960s+ Narcotics)verb
To be inattentive; be hazily preoccupied: He zoned so bad he didn't even hear the teacher call his name/ I was kind of zonin', checking things out (1980s+)
[fr ozone, ''a very high level of the atmosphere'']