From BiblePortal Wikipedia

King James Dictionary [1]

Concord n. L., the heart. See Accord.

1. Agreement between persons union in opinions, sentiments, views or interests peace harmony.

What concord hath Christ with Belial?  2 Corinthians 6 .

2. Agreement between things suitableness harmony.

If, natures concord broke, among the constellations war were sprung.

3. In music, consent of sounds harmony the relation between tow or more sounds which are agreeable to the ear. See Chord.

The man who hath not music in himself, nor is not moved with concord of sweet sounds, is fit for treasons.

4. A compact an agreement by stipulation treaty. 5. In law, an agreement between the parties in a fine, made by leave of the court. This is an acknowledgment from the deforciants that the land in question is the right of the complainant. 6. In grammar, agreement of words in construction as adjectives with nouns in gender, number and case or verbs with nouns or pronouns in number and person. Or concord may signify the system of rules for construction called syntax.

Form of concord, in ecclesiastical history, is a book among the Lutherans containing a system of doctrines to be subscribed as a condition of communion, composed at Torgaw in 1576.

Vine's Expository Dictionary of NT Words [2]

1: Συμφώνησις (Strong'S #4857 — Noun Feminine — sumphonesis — soom-fo'-nay-sis )

lit., "a sounding together" (sun, "with," phone, "a sound;" Eng., "symphony"), is found in  2—Corinthians 6:15 , in the rhetorical question "what concord hath Christ with Belial?" See Agree , A, No. 1.

Webster's Dictionary [3]

(1): (n.) An agreeable combination of tones simultaneously heard; a consonant chord; consonance; harmony.

(2): (n.) A state of agreement; harmony; union.

(3): (n.) Agreement by stipulation; compact; covenant; treaty or league.

(4): (n.) Agreement of words with one another, in gender, number, person, or case.

(5): (n.) An agreement between the parties to a fine of land in reference to the manner in which it should pass, being an acknowledgment that the land in question belonged to the complainant. See Fine.

(6): (n.) A variety of American grape, with large dark blue (almost black) grapes in compact clusters.

(7): (v. i.) To agree; to act together.

Charles Buck Theological Dictionary [4]

Form of.

Form of concord, in ecclesiastical history, a standard-book among the Lutherans, composed at Torgaw in 1576, and thence called the book of Torgaw, and reviewed at Berg by six Lutheran doctors of Germany, the principal of whom was James Anderae. This book contains, in two parts, a system of doctrine, the subscription of which was a condition of communion, and a formal and very severe condemnation of all who differed from the compilers of it; particularly with respect to the majesty and omnipresence of Christ's body, and the real manducation of his flesh and blood in the Eucharist. It was first imposed upon the Saxons by Augustus, and occasioned great opposition and disturbance. The dispute about it was revived in Switzerland in 1718, when the magistrates of Bern published an order for adopting it as a rule of faith; the consequence of which was a contest that reduced its credit and authority.

The Nuttall Encyclopedia [5]

A town in U.S., 23 m. NW. of Boston; was the residence of Emerson, Thoreau, and Hawthorne; here the first engagement took place in the American war in 1775.