1.
only one person; all alone; just one person
Emphasizes that there is just a single person, often conveying loneliness, uniqueness, or the surprising smallness of the number.
A set phrase combining たった ('only, just, merely') with 一人 ('one person'). The adverb たった emphasizes how surprisingly or strikingly small the number is. It conveys emotional weight — loneliness, isolation, or the significance of being the sole person.
Usage
たった can combine with other counters and numbers: たった一つ ('just one thing'), たった二人 ('only two people'), たった三日 ('a mere three days').