Familiar, affectionate term for one's own grandfather or an elderly man addressed as such. Often used by children or within the family.
See also: じいさん
Grandpa goes for a walk every morning.
I went to visit Grandpa's house during summer vacation.
An old man I didn't know spoke to me in the park.
爺さん is a blunter, less affectionate way to call an old man than the warm, childlike じいちゃん.
おじいさん is the polite register form used to address or refer to a grandfather or elderly man, whereas じいちゃん is the casual, affectionate family register.
祖父 is the humble, formal term used when mentioning one's own grandfather to outsiders, unlike the intimate, everyday じいちゃん.
counter for people (honorific) · first name; given name · famous; great; noted · name; title · noun (grammar)
grandpa; granddad
Kanji spelling using 爺 (old man); less common than kana but still seen.
Kanji spelling using 祖父 (grandfather); rare and somewhat redundant with the ちゃん suffix.
Search-only kana variant with long vowel mark; not a standard spelling.
Search-only kana variant with small ぃ; not a standard spelling.
Contraction of じいさん (old man/grandfather) with the affectionate suffix ちゃん. The reading じいちゃん is standard; variants like じーちゃん are informal elongations.