当選 (とうせん)being elected; being selected (to win a prize, etc.); winning (in a lottery, raffle, etc.)

being electednoun (common) (futsuumeishi), noun or participle which takes the aux. verb suru
being selected (to win a prize, etc.)noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru
winning (in a lottery, raffle, etc.)noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru

当選, its kanji, and other words that share them.Open this graph

Kanji in 当選

当初とうしょbeginning; start
当局とうきょくauthorities; relevant authorities
当時とうじat that time; in those days
当面とうめんcurrent; urgent
担当たんとうbeing in charge (of an area of responsibility); being responsible (for a work role, etc.)
本当ほんとうtruth; reality
当然とうぜんnatural; right
担当者たんとうしゃperson in charge (of an area of work); person responsible
総選挙そうせんきょgeneral election (of the lower house)
選手せんしゅplayer (sports); athlete
選手権せんしゅけんchampionship; title (of champion)
選挙せんきょelection
予選よせんpreliminary contest; qualifying round
小選挙区しょうせんきょくsmall electoral district; single-member constituency
選ぶえらぶto choose; to select
選択せんたくselection; choice

See how 当選 connects to the rest of Japanese.