fan, an enthusiast (of a performer etc.)

Short for ファンデーション (fandēshon).

fan club

Clipping of ニューファンドランド.

(fandom slang) emoji sequence used as an indication of fandom

(fandom slang) Something done by a celebrity (especially an idol, performer, or athlete) to please their fans. / (fandom slang, by extension) Elements included in a work of fiction to please fans.

chemistry (branch of natural science)

(chemistry) organic solvent

importance

kung fu: Chinese martial arts / (uncommon) efforts (devoted to a task)