actinism (noun)

1. The actinism of the ultraviolet rays in the film projector causes the film to produce images on the screen.

2. In the science fiction movie, the actinism from a distant star leads to the creation of incredible superpowers.

3. The actinism of the sun played a crucial role in the development of early photographic techniques in the history of photography.

4. In the romantic novel, the actinism of the moonlight intensifies the couple's affection for each other.