Eclipsed Conformation Definition:
The Eclipsed conformation molecular conformation in which the groups/substituents on the adjacent atoms are in closest proximity to each other. We can also say that the groups are eclipsing each other in a Newman projection.
Eclipsed Conformation Explained:
An eclipsed conformation has two atoms or groups that have a dihedral angle of 0 or 120 degrees. The bonds on an axis of rotation are aligned. This confirmation represents high torsional strain and is hence not the most stable.