1. [adj]  pertaining to the branch of philosophy dealing with the elements and laws and especially the characteristics of the universe such as space and time and causality; "cosmologic philosophy"; "a cosmological argument is an argument that the universe demands the admission of an adequate external cause which is God"
2. [adj]  pertaining to the branch of astronomy dealing with the history and structure and dynamics of the universe; "cosmologic science"; "cosmological redshift"; "cosmogonic theories of the origin of the universe"

COSMOLOGIC is a 10 letter word that starts with C.