Synonyms for the term "oneway light time" can encompass different expressions that refer to the duration it takes for light to travel a specific distance in a single direction. One synonym for this phrase could be "unidirectional light speed", denoting the speed at which light travels in a linear and singular path. Another possible synonym could be "singleroute luminal duration", referring to the time taken for light to traverse a predetermined path without any deviations. Additionally, the term "directed photon velocity" can indicate the swift movement of light particles in a particular direction without any reversals. These synonyms capture the essence of the concept, emphasizing the one-way nature and speed of light.