おじいさん (ojiisan) Japanese meaning: grandfather | KotomoraMy grandfather goes for a walk every morning.
That child wrote a letter to their grandfather.
Usage patterns
近所のおじいさんthe old man in the neighborhood
The old man in my neighborhood often greets me.
おじいさんとおばあさんgrandpa and grandma (as a pair, i.e. grandparents)
During summer vacation I went to my grandpa and grandma's house.
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.
