the best in …; the most in …

one, 1 / first, foremost / group / entirely, wholly / other / merely, only

発電: electric power generation

sunlight

location, position

full-fledged, qualified, up to standard / adulthood, behaving like an adult or as a member of the society / Used other than figuratively or idiomatically: see 一人, 前. ("one person's portion")

a (single) leaf / (figuratively) a (single) small boat / a (single) sheet (something thin: page, etc.)

a (single) body, gang, group

a (single) branch of flowers / a (single) cloud

a surname