Frequency: The word is one of the 3000 most common words in English.
1.
When people are ~ about something, they agree about it and act together.
Every party is ~ on the need for parliamentary democracy...
A ~ effort is always more effective than an isolated complaint.
ADJ
2.
United is used to describe a country which has been formed from two or more states or countries.
...the first elections to be held in a ~ Germany for fifty eight years.
ADJ
3.
United is used in the names of countries which are made up from several states or smaller countries.
...the United States of America.
ADJ: ADJ n, in names