"Tention" is not a standard scientific term. There is no scientific concept or definition that uses the word "tention."

It's possible you meant one of these words, which are related to science:

* Tension: This refers to a force that pulls on an object, stretching it. You might find this term used in physics, mechanics, or materials science.

* Attention: This refers to the focusing of mental resources on a particular stimulus. It's a term commonly used in psychology and cognitive science.

If you could provide more context about where you encountered the word "tention," I might be able to give a more accurate interpretation.