nope, twenty-first century is fine
Communication in the twenty-first century includes email, mail, telephone, cellular phone, and computer type communications. This century is known for its instant access to communication with most of the world.
Morse's telegraph
the worldwide Net concept will continue to alter the way organizations function both internally and externally in the twenty-first century, and in ways that could not be imagined in the twentieth century.
The first holiday greeting cards are thought to originate from John Calcott Horsley in 1843. These English cards eventually became popular and a part of the custom in most countries by the 20th century.
The first commercial network is often credited to AT&T, which launched its long-distance telephone service in the late 19th century. However, when considering data networks, the ARPANET, developed by the U.S. Department of Defense in the late 1960s, laid the groundwork for future commercial networks. The first commercial Internet service provider is considered to be Telenet, which began operating in 1979.
The twentyfirst century.because if its 2011 it would skip 100 years and it would be the twentyfirst century.
Yes. It should be----- Twenty-first Century Skills
ROBIN ATTFIELD has written: 'ENVIRONMENTAL ETHICS: AN OVERVIEW FOR THE TWENTYFIRST CENTURY'
'Why is Holocaust research still important in the twentyfirst century?'
Yes, you should capitalize the C in Century.
No, except at the beginning of a sentence because it is not a proper noun.
Yes you do
21stThe twentyfirst century.21st century.Answer: In 2000, it became the 21st century, and still will be when you and me are dead, the next will be 2100 since a century is 100 years. The last century was from 1900-1999. .the 21stWe are currently in the 21st century. It became the twenty first century in the year 2000. When the year 2100 comes it will then be the 22nd century. Every one hundred years becomes a new century.
You capitalize the first A but not the last a.
No, you do not capitalize "first birthday" in a sentence.
No. it's not necessary unless it forms part of the proper noun. Examples: The Twenty-first Dynasty of Egypt Twenty-first Amendment
Capitalize the first word in a sentence. Capitalize proper nouns, such as the names of people and places. Capitalize the pronoun "I." Capitalize the first word of a quote. Capitalize days of the week, months, and holidays. Capitalize the titles of books, movies, and songs. Capitalize the first, last, and important words in titles.