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"introductory" is also used as a crossword clue. If that's what you saw, the answer is often elementary (10 letters).
Definitions
serving as an introduction or preface
Word origin
Borrowed from Late Latin intrōductōrius, from Latin intrōductus.
Used in a sentence
“He enrolled in an introductory wine-making course.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Opening-level”12 letters
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