Definition of hilliness in US English:

hilliness

noun

  • See hilly

    • ‘The table above indicates average speeds for rides with different hilliness ratings in categories A though F.’
    • ‘New this year is a hilliness rating for the longest loop of the ride.’
    • ‘She knew it was one of the two because of the grassy, hilliness of the area.’
    • ‘Before you use the template, please review the definitions for the four degrees of hilliness shown below the template.’
    • ‘The designator indicates the pace, hilliness, distance and start time.’

Pronunciation

hilliness

/ˈhilēnəs//ˈhɪlinəs/