- Noun. The fact of not distinguishing or making distinctions; failure to perceive or make a difference.
- Noun. The condition or fact of not being distinct or different; absence of distinguishing qualities or characteristics; undistinguishableness.
- Noun. (obsolete) Indistinctness, obscurity, dimness.
- Noun. (context, nonce use) Absence of distinction or eminence; obscurity.