What precisely defines the phenomenon of tidal locking causing the far side to remain unseen?

The Moon takes the same amount of time to orbit Earth as it does to spin once on its axis.

Tidal locking is a specific rotational state where an orbiting body's rotation period matches its orbital period around the primary body. In the Moon's case, this means it rotates exactly once on its axis for every orbit around Earth. This precise synchronization results in the same hemisphere, the near side, always facing our planet, while the opposite hemisphere, the far side, remains perpetually hidden from direct observation from Earth. This condition was established over immense geological time as Earth's gravitational influence gradually decelerated the Moon's spin rate until this stable orientation was achieved and maintained.