5 Kanji
2.
Meaningone,
Onyomiイチ (ichi),
Kunyomiひと(つ) (hito(tsu)),
e.g.:
一年中 - Ichinenjū - All year round,
一本 - Ippon - One (when counting long, cylindrical objects. E.g.: pens, bottles, trees),
十一 - Jū ichi - eleven,