even number

(mathematics) be divisible / (chiefly in the negative) be resolvable (said of feelings), be convinced (said of the person)

negative of 割り切れる / (arithmetic) be indivisible / be insoluble, be inexplicable / (of a thing) be unconvincing; (of oneself) feel unconvinced

February

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

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.