Definition of cohomology
: a part of the theory of topology in which groups are used to study the properties of topological spaces and which is related in a complementary way to homology theory —called also cohomology theory
First Known Use of cohomology
Learn More about cohomology
Britannica.com: Encyclopedia article about "cohomology"
Seen and Heard
What made you want to look up cohomology? Please tell us where you read or heard it (including the quote, if possible).