1.
free, unrestricted
Having the ability to act, speak, or think without restrictions or constraints.
自由 functions as both a na-adjective (自由な) and a noun. As a na-adjective: 自由な (before nouns), 自由に (adverbially, meaning 'freely'). The kanji mean 'self' + 'reason/cause' - acting according to one's own will. Related compounds: 不自由 (inconvenient, disabled), 自由席 (unreserved seat).