For serious learners of Korean language or not so serious one..hehe, you could always take advantage of robust Korean-English Naver dictionary. Previously, I used Google translate to find the meanings of Korean words that I don't understand, but sometimes it returned plainly incorrect or ridiculous result. Hence, I tried Naver dictionary as advised by Min Young.
Click 사전 means dictionary
There are a few good sides of Naver dictionary that I like. Just for example it offers a few type of dictionary searches:
한자사전 - Chinese character dictionary
중국어사전 -Korean - Chinese dictionary
의약학사전 - Medicine dictionary
영어사전 - Korean - English
국어사전 - Korean
일본어사전 - Japanese - Korean 용어사전 - Glossary
So, which one should you use for Korean-English search?
Use this one. For example if you want to search the meaning of 안녕하세요
전체 - All
단어/숙어 - Words/Idioms
본문 - Text
예문 - Example
유의어 - Synonym
검색 - Search/Retrieve
Hello, front desk, how may I help you?
안녕하세요. 프런트입니다. 무엇을 도와 드릴까요?