IPA: /ˈtaɪtɪst/
KK: /taɪtɪst/
The most close-fitting or firmly held; having little or no space between parts.
She wore the tightest dress at the party, which made her stand out.
Comparative: tighter
Superlative: tightest
Tightest is formed from "tight" (from Old English "tihht", meaning firmly held or secure) and the suffix "-est" (meaning the most). The word "tightest" refers to the state of being the most firmly held or secure.
Think of something that is held the most firmly — 'tight' means secure, and '-est' indicates the highest degree. This helps you remember that 'tightest' means the most secure.