A grandchild of one's grandparent's first cousin.

(physics) Newton's observation that to every action (force applied) there is an equal and opposite reaction (equal force applied in the opposite direction)

(historical) The thirteen British colonies that successfully revolted in 1775--1781, forming the nucleus of the United States of America. To wit: New Hampshire, Massachusetts (including present-day Maine), Rhode Island, Connecticut, New York (including present-day Vermont), New Jersey, Pennsylvania, Maryland, Delaware, Virginia (including present-day West Virginia), North Carolina, South Carolina, and Georgia.

A musical interval with exactly three half steps that spans two degrees of diatonic scale.

(music) A musical interval of the Western twelve-semitone system consisting of four semitones and spanning three degrees of the diatonic scale. Major scales are so named because of the major third interval between the tonic and mediant of a major tonic triad. It is enharmonically equivalent to a diminished fourth.

Most inferior in quality or standing.

plural of major third

plural of minor third

In the third place; third in a row.

(historical, Scotland) The right of the owner of a mill to compel tenants to bring all their grain to that mill for milling.