EMの定義と意味 - メリアム・ウェブスター

EM Definition & Meaning - Merriam-Webster Est. 1828 Dictionary Definition noun abbreviation prefix noun 3 noun abbreviation prefix Word History Rhymes Entries Near Cite this Entry Citation Kids Definition Kids Medical Definition Medical Show more Show more Citation Kids Medical Save Word To save this word, you'll need to log in. Log In em 1 of 3 noun ˈem 1 : the letter m 2 : the width of a piece of type about as wide as it is tall used as a unit of measure of typeset matter EM 2 of 3 abbreviation 1 electromagnetic 2 electron microscope; electron microscopy 3 end matched 4 engineer of mines 5 enlisted man em- 3 of 3 prefix see en- Word History First Known Use Noun 13th century, in the meaning defined at sense 1 Time Traveler The first known use of em was in the 13th century See more words from the same century Rhymes for em clem femme gem hem phlegm rem stem them atm chernozem diadem ibidem See All Rhymes for em Browse Nearby Words Elzevir em EM See all Nearby Words Cite this Entry Style MLA Chicago APA Merriam-Webster “Em.” Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/em. Accessed 1 May. 2026. Copy Citation Kids Definition em- see en- Medical Definition EM abbreviation 1 electromagnetic 2 electron microscope; electron microscopy 3 emergency medicine Love words? Need even more definitions? Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Merriam-Webster unabridged More from Merriam-Webster Word of the Day Beltane See Definitions and Examples » Get Word of the Day daily email! Popular in Grammar & Usage See More More Commonly Mispronounced Words 5 Verbal Slip Ups and Language Mistakes Is that lie 'bald-faced' or 'bold-faced'? The Difference Between 'i.e.' and 'e.g.' Why is '-ed' sometimes pronounced at the end of a word? See More Popular in Wordplay See More The Longest Long Words List 9 Other Words for Beautiful Was 'nervous Nellie' a Real Person? 12 Lovely and Unusual Words for the Natural World Why do we 'bury the lede?' See More Popular See More More Commonly Mispronounced Words The Longest Long Words List 9 Other Words for Beautiful See More Games & Quizzes See All Quordle Can you solve 4 words at once? Play Blossom Pick the best words! Play The Missing Letter A daily crossword with a twist Play Name That Tree! A quiz that’s all bark, no bite. Take the quiz See All