An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

Existing as the only one or as the sole example.
Limited to a single outcome or result. → uniqueness theorem.

From Fr. unique, from L. unicus "single, sole," from unus, → one.

Yektâ "unique," from yek, → one, + tâ "fold, plait, ply; piece, part" (Mid.Pers. tâg "piece, part").

The state or condition of being → unique.

Noun from → unique.

1) Physics: A → potential that satisfies both → Poisson's equation and the → boundary conditions pertinent to a particular field is the only possible potential.
2) Math.: If two → continuous functions φ(t) and ψ(t) have one and the same → Laplace transform F(p), then these functions are identically equal.
3) Astro.: A → black hole can only be characterized by its → mass, → electric charge, and → angular momentum. See also → no hair theorem.

→ uniqueness; → theorem.