/əˈkɔːrd/
[noun] A formal agreement between people, groups, or countries. It can also mean a state of harmony or agreement between things or people.
At its heart, 'accord' means two hearts beating together — it literally comes from the Latin word for 'heart.'
Few words carry their meaning so literally inside them as 'accord.' The word reaches back to the Latin noun *cor*, meaning 'heart' — the physical organ, yes, but also the seat of feeling, intention, and will. From *cor* came the Latin verb *concordare*, meaning to be of one heart or to agree, built from *con-* (together) + *cor* (heart). This same root gave English words like 'concordance,' 'discord,' and even 'courage,' all of which carry that ancient pulse of the heart inside them.
The word passed into Old French as *acorder*, where it meant to bring into harmony or to settle a dispute — literally to make two hearts beat as one. Old French was the language of law, courtly life, and administration in medieval Europe, and *acorder* was used in legal and diplomatic contexts to describe parties reaching a settlement. The prefix *a-* here is a softened form of Latin *ad-*, meaning 'toward,' so the sense was of moving toward heart-agreement, toward unity of purpose.
English adopted *accord* from Old French in the 12th century, during the period of intense French influence that followed the Norman Conquest of 1066. For nearly two centuries after the Conquest, the ruling classes of England spoke Old French, and huge numbers of French words poured into the English language, especially in the areas of law, government, and diplomacy — precisely where 'accord' was most at home. Early English uses of the word appear in legal texts describing treaties and settlements between lords and kings.
Over the following centuries, the word broadened its reach. While it kept its formal diplomatic sense — as in international peace accords — it also developed a musical meaning, describing notes that sound harmonious together, a chord. This is no coincidence: the musical term 'chord' is itself a contracted form of 'accord,' shortened through everyday speech. The idea that agreeing voices, like agreeing notes, create something beautiful rather than clashing, runs through the word's entire history.
The phrase 'of one's own accord,' meaning voluntarily and without outside pressure, appeared in English by the 15th century and remains in common use today. It preserves the original sense of the heart acting freely from within. Meanwhile, the related word 'discord' — built from Latin *dis-* (apart) + *cor* (heart) — became the perfect opposite: hearts pulling in different directions, whether between arguing people or clashing musical notes. Together, accord and discord form a pair that maps the whole spectrum of human agreement and conflict back to a single beating heart.