bidirectional (adjective)

1. The artist used bidirectional brushstrokes to create a sense of movement in the painting.

2. According to Greek mythology, Janus, the god of beginnings and transitions, had a bidirectional face that symbolized looking to the past and future simultaneously.

3. The symbol of the yin and yang in Taoism represents the bidirectional flow of opposing forces in the universe.

4. In the science fiction novel, the spaceship had bidirectional engines that allowed it to travel forward and backward in time.