Longman Dictionary of Contemporary English homepage

need-to-know

 adjective
     
need-to-know

on a need-to-know basis

if information is given to people on a need-to-know basis, they are given only the details that they need at the time when they need them:
Access to the manufacturing process is on a strictly need-to-know basis.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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