There are several synonyms for the word "accension." One of the most commonly used synonyms is "escalation," which refers to the process of something becoming more intense or severe. Another synonym is "rise," which refers to an increase or upward movement in something. A third synonym is "climb," which refers to a gradual increase or ascent in something. Other synonyms include "ascendancy," "surge," "upswing," "boost," and "growth." Each of these words can be used to describe the process of something increasing or becoming more pronounced, whether it's a feeling, a physical phenomenon, or a trend.