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

Class I. Words Expressing Abstract Relations
Section II. Relation
4. General Relation

23. Agreement.

   NOUN:AGREEMENT, accord, accordance; unison, harmony; concord [See Concord]; concordance, concert; understanding, mutual understanding; gentleman’s agreement, entente cordiale [F.], consortium; unanimity, consension [rare], concentus, consentaneity.
  CONFORMITY [See Conformity]; conformance; uniformity [See Uniformity]; assonance, consonance, consentaneousness, consistency; congruity, congruence or congruency; keeping; congeniality; correspondence, concinnity, parallelism, apposition, union.
  FITNESS, aptness &c. adj.; relevancy; pertinence or pertinency; sortance [obs.]; case in point; aptitude, coaptation, propriety, applicability, admissibility, commensurability, compatibility; cognation (relation) [See Relation].
  ADAPTATION, adaption, adjustment, graduation, accommodation; reconciliation, reconcilement; assimilation.
  CONSENT (assent) [See Assent]; concurrence [See Concurrence]; consensus, rapport [F.], meeting of minds, coöperation [See Coöperation].
  right man in the right place, very thing; quite the thing, just the thing.
   VERB:BE ACCORDANT &c. adj.; agree, accord, harmonize; correspond, tally, respond; meet, suit, fit, befit, do, adapt itself to; fall in with, chime in with, square with, quadrate with, consort with, comport with; dovetail, assimilate; fit like a glove; fit to a tittle, fit to a T; match [See Similarity]; become one; homologate.
  consent (assent) [See Assent].
  RENDER ACCORDANT &c. adj.; fit, suit, adapt, accommodate; graduate; adjust &c. (render equal) [See Equality]; dress, regulate, readjust; accord, harmonize, reconcile; fadge, dovetail, square.
   ADJECTIVE:AGREEING, suiting &c. v.; in accord, accordant, concordant, consonant, congruous, consentaneous [archaic], answerable, correspondent, congenial; coherent; becoming; harmonious, reconcilable, conformable; in accordance with, in harmony with, in keeping with, in unison with &c. n.; at one with, of one mind, of a piece; consistent, compatible, proportionate; commensurate; on all fours with.
  APT, apposite, pertinent, pat; to the point, to the purpose; happy, felicitous, germane, ad rem [L.], in point, bearing upon, applicable, relevant, admissible.
  FIT, adapted, in loco [L.], à propos [F.], appropriate, seasonable, sortable, suitable, idoneous [rare], deft; meet (expedient) [See Expedience].
  at home, in one’s proper element.
   ADVERB:à propos of; pertinently &c. adj.
  1. Rem acu tetigisti.
  2. The cap fits.
  3. Auxilia humilia firma consensus facit.—Syrus
  4. Concordia discors.—Horace
  5. Be not the first by whom the new is tried, Nor yet the last to lay the old aside.—Pope