Definition of in a world of one's own
- I tried to talk to him, but he was in a world of his own and didn't seem to hear what I was saying.
: the earthly state of human existence
: life after death
: the earth with its inhabitants and all things upon it
: of or relating to the world
: extending or found throughout the world : worldwide
: involving or applying to part of or the whole world
: belonging to oneself or itself
used to express immediate or direct kinship
: to have or hold as property : possess
: to have power or mastery over
: to acknowledge to be true, valid, or as claimed : admit
: one or ones belonging to oneself
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