Correct spelling for the English word "TERRAGE" is [tˈɛɹɪd͡ʒ], [tˈɛɹɪdʒ], [t_ˈɛ_ɹ_ɪ_dʒ] (IPA phonetic alphabet).
I apologize, but "TERRAGE" does not appear to be a recognized or commonly used term in the English language, nor does it have a dictionary definition. It is possible that it may be a unique term or a typographical error. Without further context or information, it is difficult to provide an accurate definition for the term "TERRAGE."
To ensure accuracy and relevance, it is recommended to verify the spelling and context of the word. Alternatively, if "TERRAGE" is a term specific to a particular field, industry, or jargon, providing more information or context regarding its usage could assist in offering a more precise definition.