[ad. F. concerte-r (16th c.), ad. It. concertare to proportion or accord together, to agree or tune together, to sing or play in concert.
The Italian is identified by Diez with L. concertāre intr., to contend zealously, dispute, debate. Such a change of sense might conceivably come about through an intermediate argue out, settle by debate, whence come to terms, arrange terms; but evidence is wanting. Florio has, in 16th-c. It., conserto, consertare, as parallel forms of concerto, concertare; these (if real words) point to L. *consertāre freq. of conserĕre to join or fit together, connect; the same origin has been claimed by Spanish etymologists for Sp. concertar, which has among other senses to mend a thing broken. But here the phonetic change is unexplained. Already in 16th-c. It. concerto was associated in the musical sense with concento (CONCENT); Florio, 1598, gives concerto merely with a cross-reference to concento. Hence a conjecture that concerto, concertare were perversions of conserto, consertare, under the influence of concento: but what then of Sp. concertar?
In Eng. used by Barret, from It., in 1598; app, not otherwise in use till taken from Fr. nearly a century later.]
† 1. trans. To bring to agreement or unity; to unite. Obs.
1598. Barret, Theor. Warres, II. i. 22. When as he cannot concert and agree them [soldiers], he is to referre them ouer vnto his Captaine.
1696. Brookhouse, Temple Open., 2. Being now concerted into a New Body.
2. To arrange or contrive (measures, an enterprise, etc.) by mutual agreement.
1694. Molesworth, Acc. Denmark (ed. 3), 47. A Design before concerted between him and the Bishops.
1710. Swift, Lett. (1767), III. 35. I have been walking, and concerting where to see Mr. Harley.
1725. De Foe, Voy. Round World (1840), 207. We began to concert measures for his coming on board with secrecy.
1836. Thirlwall, Greece, II. 21. The insurrection seems not to have been judiciously concerted.
b. Of a single person: To plan, devise, arrange.
1712. Hearne, Collect. (Oxf. Hist. Soc.), III. 498. I must now concert matters about yt Affair.
1878. Bosw. Smith, Carthage, 433. He could concert his measures against any state.
c. intr. To arrange a matter by agreement with some one; to form plans. ? Obs.
1707. Freind, Peterborows Cond., 174. You may concert in every thing with Prince Henry.
1786. T. Jefferson, Writ. (1859), I. 567. The gentlemen with whom we had before concerted.
1791. Boswell, Johnson, 2 June, an. 1781. I therefore concerted with Mr. Dilly, that I should steal away.
1796. Nelson, 10 July, in Nicolas, Disp. (1845), II. 208. We concerted on the most proper methods for speedily executing the Vice-Roys instructions.
3. intr. To sing or play in concert. rare.
1827. Pollok, Course T., VII. The thrush Concerting with the lark that hymned on high.
1879. [see CONCERTING].
4. Mus. (trans.) To arrange in parts. (nonce-use from CONCERTED 2, q.v.)
1884. G. Moore, Mummers Wife (1887), 160. [I do not know] whether I ought to concert that first number or have it sung in unison.
† II. 5. [L. concertāre.] To dispute (a statement, etc.). Obs. rare.
1689. Apol. Failures Walkers Acc., 11. Though Mr. Walker might modestly concert the Truth of those Passages yet right he at no hand dispute inserting em.