strictly

From 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.

   • 2012, David Walliams [pseudonym; David Edward Williams], Ratburger, London: HarperCollins Children’s Books, →ISBN:

     “If any pupil considers it acceptable to bring a pet into this school, let me tell you it is forbidden. Strictly forbidden!” pronounced the headmaster from the front of the class.

2. In a limited manner; only
   • 1943 November – 1944 February (date written; published 1945 August 17), George Orwell [pseudonym; Eric Arthur Blair], Animal Farm […], London: Secker & Warburg, published May 1962, →OCLC:

     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.

   • 2017 June 14, Mark Carnall, “The ancient mystery of St Hilda's 'snake stones': what do ammonites really look like?”, in The Guardian‎^[1]:

     Scientific naming conventions are such that technically, ammonites are ammonoidean, ammonitidan, and sometimes strictly ammonitinan cephalopods.

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