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Classic usage
Reading level: hard
Estimated CEFR level: C1 — Advanced
Estimated from word frequency; not an official CEFR classification.
From Middle English stranghalde, strong-hold, strong-holde, from strong (“having physical strength, sturdy, strong; built to withstand assaults, fortified”) (from Old English strang, strong (“strong”), ultimately from Proto-Indo-European *strengʰ- (“stiff, tight”)) + hōld (“grasp, grip; control, possession, rule”) (from Old English). By surface analysis, strong + hold.
fastness
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Classic usage
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