When people talk about climbing a mountain, they usually say they're going up the mountain for the ascent. The hardest part of the climb might be the steep and difficult ascent to the summit. Sometimes you'll hear about someone making an ascent in their career - like getting promoted to a higher position at work.
How common is "ascent"?
Word ascent is considered rare in modern English. It has a balanced usage among all categories: speech, fiction, newspapers and academic texts.
Definitions
noun
The act of ascending; a motion upwards.
Example: He made a tedious ascent of Mont Blanc.
The way or means by which one ascends.
Example: There is a difficult northern ascent from Malaucene of Mont Ventoux.
An eminence, hill, or high place.
The degree of elevation of an object, or the angle it makes with a horizontal line; inclination; gradient; steepness
Example: The road has an ascent of 5 degrees.
(typography) The ascender height in a typeface.
An increase, for example in popularity or hierarchy