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

• Lexulous
• Wordscraper
• Wordosaur

adj. Serving or intended to explain: an explanatory paragraph.

adj. Intended to serve as an explanation.

adj. Disposed to explain.

adj. Serving to explain; containing explanation; as explanatory notes.

Serving to explain; containing explanation; of the nature of explanation: as, explanatory notes.

adj. serving or intended to explain or make clear

"The Dominican Congress added what it called explanatory articles to the law by which it approved the convention but made no change therein."

instructive    informative   

interpretative    elucidative    elucidatory    explanative    expository    expositive    expositional    exegetical   

forego    introductory    biographical    lengthy    cryptic    instructive    descriptive    confidential    terse    copious