"NI3" is Webster's New International Dictionary, 3rd Edition.

in these parts, a.k.a. W3

Autre temps, autre moeurs. "Other times, other customs." Totally fabricated-on-the-spot rationalization why my way is better: why use a three-syllable word when two syllables will do?

By either name I've never liked that dictionary, except maybe to check spelling. I've never forgiven them for including "uninterested" as a synonym for "disinterested." Among other transgressions.
(Besides, who ya gonna believe - me or some strange dictionary?)