IPA: /ˈtaɪtə/
KK: /ˈtaɪtər/
Having less space or being more firmly held than before.
The lid on the jar is tighter now after I closed it.
Comparative: tighter
Superlative: tightest
Tighter → It is formed from "tight" (from Old English "tiht", meaning firmly held or close) and "-er" (a comparative suffix meaning more). The word "tighter" means more firmly held or closer than something else.
Think of something being held 'more firmly' — 'tight' means firmly held, and '-er' indicates a comparison, so 'tighter' means more tightly held.