Wiktionary
threedimensional
a. (alternative spelling of three-dimensional English)
Usage examples of "threedimensional".
Her kinesthetic sense was acute, she could solve multiunit threedimensional vector intercepts in her head (as long as she didnt think about what she was doing), and none of that ability had shown up in her applied mathematics grades.
The type of internal computer model that it needs, therefore, is one suitable for the internal representation of the changing positions of objects in threedimensional space.