Cornerstone
The crossword clue "Cornerstone" is answered by BASIS, a 5-letter entry. Used 6 times across 6 distinct years; most recently in 2024; first recorded in 1968. It appears in 5 publications in the xd corpus. Every figure on this page comes from the collection data itself, never from a guess.
The answer
BASIS
5 letters. See every clue for this answer on the BASIS answer page.
Used 6 times across 6 distinct years; most recently in 2024; first recorded in 1968. It appears in 5 publications in the xd corpus. Frequency and last-seen figures come from the xd crossword corpus only.
Other answers for this clue
The same clue has also been answered these ways in the xd corpus. Answers inside this collection link to their own answer page.
- QUOIN (4 uses in xd)
Other clues for BASIS
Every other clue in this collection answered by BASIS, most used first.
- Foundation - used 146 times, most recently in 2026
- Groundwork - used 45 times, most recently in 2026
- Grounds - used 43 times, most recently in 2026
- On a need-to-know ___ - used 20 times, most recently in 2026
- Starting point - used 13 times, most recently in 2025
- Fundamental principle - used 11 times, most recently in 2016
- Rationale - used 11 times, most recently in 2026
- Underlying principle - used 10 times, most recently in 2025
Related clues
Clues in this collection of the same answer length that share a word with this clue, or match its answer pattern when no word is shared. Most used first.
- Cornerstone abbr. - ESTAB, used 54 times
- Abbr. on a cornerstone - ESTAB, used 13 times
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