Teleparallelism (also called teleparallel gravity), was an attempt by Einstein to base a unified theory of electromagnetism and gravity on the mathematical structure of distant parallelism, also referred to as absolute or teleparallelism. In this theory, a spacetime is characterized by a curvature-free linear connection in conjunction with a metric tensor field, both defined in terms of a dynamical tetrad field.
Read more about Teleparallelism: Teleparallel Spacetimes, New Teleparallel Gravity Theory, New Translation Teleparallel Gauge Theory of Gravity