Synonyms for descent

noun

1. A downward incline

   declivity, slope, drop; see grade 1, inclination 5.

2. The act of descending

   drop, fall, falling, coming down, sinking, degradation, abasement, droop, cadence, debasement, slump, downfall, drop, lapse, slide, subsiding, declination, swoop, plunge, dip, reduction, precipitation, landslide, tumble, decline; see also fall 1.

   Antonyms rise*, mounting, growth.

3. Lineal relationship

   extraction, origin, lineage; see family 1, relationship.

4. An invasion

   advance, incursion, assault; see attack 1.