"the circle in the sky followed by the Sun," late 14c., from Medieval Latin ecliptica, from Late Latin (linea) ecliptica, from Greek ekliptikos "of an eclipse" (see eclipse (n.)). [..]

An imaginary line in the sky traced by the Sun as it moves in its yearly path through the sky.

The great circle in the celestial sphere that is the apparent annual path of the sun around the earth. The plane in which this circle lies is the plane of the ecliptic. The angle that this plane makes [..]

the apparent circular path of the sun around the Earth as seen from the ground.

The path among the stars traced by the Sun throughout the year. The Moon and planets never stray far from the ecliptic.

— A term applied to the invisible path in the sky that the Sun moves through during the year, in relation to Earth and the other planets.

The apparent annual path of the Sun on the celestial sphere.

Two equivalent definitions are possible.

(n) the great circle representing the apparent annual path of the sun; the plane of the Earth's orbit around the sun; makes an angle of about 23 degrees with the equator

The great circle formed by the intersection of the plane of the Earth's orbit around the Sun (or apparent orbit of the Sun around the Earth) and the celestial sphere.

(n.) The plane of the earth's orbit about the sun, which is approximately the plane of the solar system as a whole. The apparent path of the sun across the sky is the projection of the ecliptic o [..]

The intersection of the plane of the Earth's orbit with celestial sphere.

A line around the middle of the celestial sphere, connecting the points occupied by the Sun over the year. The moon and the visible planets also appear to move very close to that line, which cuts the [..]

Great circle of celestial sphere in which Earth revolves around Sun. So named because Moon must be in it, or near it for an eclipse to occur.

the apparent annual path of the Sun among the stars; the intersection of the plane of the Earth's orbit with the Celestial Sphere. this is a great circle of the Celestial Sphere inclined at an an [..]

The plane in which Earth orbits the sun and in which solar and lunar eclipses occur.

the great circle formed by the intersection of the plane of the earth’s orbit with the celestial sphere; the apparent annual path of the sun in the heavens.

The great circle on the celestial sphere which traces the path of the Sun during the year.

The great circle made by the intersection of the plane of the Earth’s orbit with the celestial sphere. (Less properly, the apparent path of the Sun around the sky during the year.) definition courtesy of: NWS Space Weather Prediction Center

the apparent path that the sun takes through the stars during the year

The sun's apparent path across the sky that tracks a circle through the celestial sphere.

The sun's apparent path across the sky that tracks a circle through the celestial sphere

Plane in which the Earth orbits the Sun.

the plane in which the Earth orbits the Sun

The sun’s apparent path across the sky that tracks a circle through the celestial sphere.

(astronomy) The apparent path of the Sun in the sky. More accurately, it is the intersection of the celestial sphere with the plane of the ecliptic, which is the geometric plane containing the mean [..]