Nationwide, National, Countrywide
noun, の adjective
When something involves all the country you know it's nationwide or national.
ぜんこく
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
今、全国でインフルエンザの人が多いです。
Right now, there are many people with flu nationwide.
日本全国の山に行きたいです。
I want to go to mountains all over Japan.
あのバンド、来年に全国ツアーをするそうですよ。
That band is apparently going on a nationwide tour next year.