This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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• Wordscraper
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v. Present participle of delimit.

adj. that serves to delimit

"In a great many languages composition is confined to what we may call the delimiting function, that is, of the two or more compounded elements one is given a more precisely qualified significance by the others, which contribute nothing to the formal build of the sentence."

delimited    delimiting    delimits   

limit    circumscribe    confine   

specify    define    delineate    delimit