Descension is not a modern English word—500 years ago, it had the same meaning as descent, “to go down”; but now, it's use is so rare, most publications would not consider it a word, other than to mention its historical usage.
Dissension is a modern word and, similarly to the descension/descent relation, dissension has the same meaning as dissent; it means “disagreement or rebellion”:
The dissension among students, against the university’s policies, led to a protest action.
It is more normal to use dissent than dissension, though they can be used in exactly the same way.
You can remember the difference between descension and dissension by remembering that dissension contains the same dis- in disagreement.
More Examples of How to Use "Dissension" in a Sentence
- There was a serious dissension between the council and the residents over the proposed law.
- The unrest in the country is the result of a political dissension that has been as targeted as it is fabricated.
- There was dissension among the siblings over which parent should get primary custody.
- Negotiations have been plagued by dissension among the nations.
- The political dissension in the country is a threat to national security.
More Examples of How to Use "Descension" in a Sentence
- She descended the stairs, looking quite pleased with herself.
- The cold rain pelted him as he made his descension (descent) down the mountain.
- The descension (descent) from a high altitude to sea level can cause a person to experience altitude sickness.
- The descension (descent) into the mine was gradual, making it easier for workers to move through it.
- Since it was too dark to see, the hikers used their flashlights to descend the treacherous path.