* Constantly evolving language: English is a living language that constantly evolves. New words are coined, old words fall out of use, and meanings shift over time.
* Defining "derived": Even if a word has a Latin or Greek root, it may have been significantly altered over time or combined with other elements, making it difficult to determine the exact level of influence.
* Multiple sources: English vocabulary comes from numerous sources, including Old English, French, German, and other languages.
However, it is safe to say that Latin and Greek have had a profound impact on English vocabulary.
* Latin: Has influenced many words related to science, law, religion, and government.
* Greek: Has contributed significantly to scientific terminology, philosophy, and the arts.
Estimates: Some sources suggest that up to 60% of English vocabulary may be derived from Latin and Greek, though this is a broad estimate.
It's important to remember that the percentage doesn't necessarily reflect the importance of Latin and Greek to the English language. These languages have significantly shaped the structure and meaning of the English lexicon, giving it a richness and complexity unmatched by many other languages.