According to Osho, a siddha is one who is utterly unattached and therefore unbroken—an indivisible, nondual presence in which all divisions (I/you, inner/outer, light/dark) have dissolved. In this realized state, one’s whole being is one continuum: seed, field, farmer, and fruit are oneself; reality is non-relative, contradictions vanish, and the person stands as a complete, undivided individual (abhang).
A siddha is someone so free of attachment that they are whole and one with everything, with no inside/outside or me/you left.