strictly

strict +‎ -ly

• IPA^(key): /ˈstɹɪktli/

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strictly (comparative strictlier or more strictly, superlative strictliest or most strictly)

1. In a strict manner.

   He adhered strictly to the diet his doctor prescribed.

2. In a limited manner; only
   • 1945 August 17, George Orwell, chapter 6, in Animal Farm: A Fairy Story, London: Secker & Warburg, OCLC 3655473:

     This work was strictly voluntary, but any animal who absented himself from it would have his rations reduced by half.

3. In a narrow or limited sense.

   That term refers strictly to smaller birds.

4. (mathematics) In a manner that applies to every member of a set or every interval of a function