Strictly means in a way that allows no exceptions. Strictly forbidden, strictly speaking, strictly by appointment.
Strictly forbidden and strictly prohibited are the standard forms on signs. Strictly speaking introduces a precise correction and usually means the speaker is about to be pedantic and right. Strictly between us means in confidence. Note that in Britain Strictly on its own means the television dancing programme, which has made the word instantly recognisable in a way it was not before about 2004.
1adverbstrictlyIn a way that allows no exceptions.
“Smoking is strictly forbidden anywhere in the hospital.”
2adverbintroduceUsed to introduce a precise correction.
“Strictly speaking it is a fruit, as somebody always says.”
Too few real examples of this word to estimate which sense is commonest.
strictly is a manner of exactness.
Proto-Indo-European
*streyg-
Latin
strictus
English
strict
English, today
strictly
Built from
From strict + -ly. strict Borrowed from Latin strictus, past participle of stringere (“to draw tight, bind, contract”). a doublet of strait and stretto. See stringent, strain. Related to strong.
Etymology from Wiktionary, CC BY-SA