....THE definition in the older dictionaries when definitions were sacrosanct before the snowflakes thought it was OK to alter a definition to what THEY thought a word should mean.
The quality of definitions and clarity of communication is in the toilet.
Not to argue that the English (and other) languages are grossly abused and misrepresented by some "snowflakes" that know better than the rest of us as to what a word should mean, semantic change is the evolution of word usage.
From Wikipedia, the free encyclopedia
Semantic change (also semantic shift, semantic progression, semantic development, or semantic drift) is the evolution of word usage—usually to the point that the modern meaning is radically different from the original usage. In diachronic (or historical) linguistics, semantic change is a change in one of the meanings of a word. Every word has a variety of senses and connotations, which can be added, removed, or altered over time, often to the extent that cognates across space and time have very different meanings. The study of semantic change can be seen as part of etymology, onomasiology, semasiology, and semantics.
https://en.wikipedia.org/wiki/Semantic_change
The link provides a number of examples.
Note: While I BELIEVE sex includes more than just "penis in vagina" - that doesn't give me the right to change the definition. There's more to "word evolution" that that - otherwise there would be literally thousands of definitions for sex (or other terms).