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air·tight

airtight

 
pronunciation:
eIr taIt
part of speech: adjective
definition 1: keeping air in or out.
Please put whatever you don't eat in an airtight container so that it will still be fresh tomorrow.
definition 2: having no weak points that could be open to attack.
I knew I had an airtight excuse for not doing my homework when I showed my teacher the note from the hospital.
derivation: airtightness (n.)