comitative

[kom-i-tey-tiv, -tuh-tiv]Grammar
noun
  1. the comitative case.

Origin of comitative

1855–60; < Latin comitāt(us) retinue, escort (comit-, stem of comes companion (see comes) + -ātus -ate3) + -ive
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018