Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class I. Words Expressing Abstract Relations
Section II. Relation
1. Absolute Relation

13. Identity.

   NOUN:IDENTITY, sameness, identicalness, unity, selfsameness, coincidence, coalescence; convertibility; equality [See Equality]; selfness, self, oneself; identification.
  CONNATURALITY, connature, connaturalness, homogeneity.
  MONOTONY; tautology (repetition) [See Repetition].
  FACSIMILE (copy) [See Copy]; homoousia; alter ego [L.] (similar) [See Similarity]; ipsissima verba [L.] (exactness) [See Truth]; same; selfsame, very same, one and the same; counterpart; very thing, actual thing; no other.
   VERB:BE IDENTICAL &c. adj.; coincide, coalesce.
  treat as the same, render the same; treat as identical; render identical; identify; recognize the identity of.
   ADJECTIVE:IDENTICAL; self, ilk [archaic]; the identical same &c. n.; selfsame, homoousian, one and the same; ditto.
  COINCIDENT, coinciding, coalescing, coalescent, indistinguishable; one; equivalent (equal) [See Equality]; much the same, much of a muchness; unaltered.
   ADVERB:IDENTICALLY &c. adj.; on all fours with; ibidem [L.], ibid.
  1. Liberty and Union, now and forever, one and inseparable.—Webster
  2. All one body we, One in hope, in doctrine, One in charity.—Baring-Gould
  3. The selfsame flight, the selfsame way.—Merchant of Venice
  4. Another, yet the same.—Pope