An Etymological Dictionary of Astronomy and Astrophysics
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1) Astro.: A relationship between the orbital period of one body around another and its rotational period on its axis. The relationship results from tidal forces between the two bodies. For example, the rotation period of the Moon equals its revolution period around the Earth.
2) Quantum mechanics: The interaction between a particle's → spin angular momentum and its → orbital angular momentum.

→ spin; → orbit; → coupling.

An orbit in which the satellite revolves about the primary at the angular rate at which the primary rotates on its axis. From the primary, the satellite thus appears to be stationary over a point on the primary.

→ stationary; → orbit.

→ synchronous rotation.

→ synchronous; → orbit.

A shorter → horseshoe orbit confined to the → Lagrangian points L4 or L5.

→ tadpole; → orbit.