level structure
extra structure attached to a space that rigidifies the space, i.e. such that the automorphism group of X preserving this structure is trivial
en-GB/ˈlɛvl ˈstɹʌkt͡ʃə/
en-US/ˈlɛvəl ˈstɹʌkt͡ʃɚ/
extra structure attached to a space that rigidifies the space, i.e. such that the automorphism group of X preserving this structure is trivial