February

(music) final downmixing of tracks to 2 left and right (stereo) channels

January

(business) one on one meeting between an employee and a superior

vitamin D2

Synonym of リボフラビン (ribofurabin, “riboflavin”); vitamin B2

2.5D / (by extension, fandom slang) belonging to a grey area between "2D" (anime, etc.) and "3D" (live-action, etc.), such as voice actors

(Internet slang) A member of the online 2channel community.

(Internet slang) first comment; (interjection) first!

(informal, chiefly in the negative) the slightest amount (in reference to one's knowledge, thought, etc.) / Used other than figuratively or idiomatically: see 一, ミリ.