Answer
This means that someone's eyes stand out, are very noticeable, clearly defined, etc. Example, a person has beautiful eyes or some other distinguishing aspect that makes them very evident. It would be kind of like someone having a distinguishing voice - a voice that is different, pleasing, or nice to listen to, etc.
Her performance markedly improved after she switched coaches and began training with Brian Orser.
You could use the word "substantially" instead. Say you saw someone after a lot of years, you could say they had changed markedly. Or if someone did something good or bad that affected someone else a lot you would say that it had affected them markedly.
In markedly the ed is prounounced mark- ed-ly. Marked is pronounced as though there is only a d on the end 'markd'
markedly
No, it is not an adverb. The word marked is a past tense verb (and past participle) and can be used as an adjective. The related adverb is "markedly" but means to a substantial or noticeable degree (e.g. markedly different standards).
freak means: a person or animal that is markedly unusual or deformed
isoniazid
The recordings of these last two interviews are markedly inferior.
Adipose tissue
greatly, very much, significantly, remarkably, substantially, markedly, noticeably, appreciably
Severe, definitely, clearly, obviously, plainly, patently, decidedly, markedly, noticeably
'It is evident,' perhaps? Or 'evidently,' or 'markedly'. Although using adverbs too often at the beginning of sentences gets tiresome. 'It is evident,' perhaps? Or 'evidently,' or 'markedly'. Although using adverbs too often at the beginning of sentences gets tiresome.