vergence
Concise Oxford English Dictionary © 2008 Oxford University Press:
vergence/ˈvəːʤ(ə)ns/
▶noun
- 1 Physiology the simultaneous movement of the pupils of the eyes towards or away from one another during focusing.
- 2 Geology the direction in which a fold is inclined or overturned.
– origin 1980s: common element of convergence and divergence.
'vergence' also found in these Oxford entries:

