conformation

Concise Oxford English Dictionary © 2008 Oxford University Press:
conformation/kɒnfɔːˈmeɪʃn/

▶noun the shape or structure of something.

■ Chemistry any of the spatial arrangements which the atoms in a molecule may adopt, especially by rotation about individual single bonds.

– derivatives
conformational adjective.

– origin C16: from L. conformatio(n-), from conformare (see conform).