noun🔗ShareA count backward in fixed units to the time of some event, especially the launch of a space vehicle."The class watched the countdown on the screen as the model rocket prepared for launch. "timetechnologyspaceastronomyeventChat with AIVocabulary GamePractice Reading
noun🔗ShareThe acts of preparation carried out during this period."During the launch countdown, engineers checked all the systems. "actiontimeeventprocessChat with AIVocabulary GamePractice Reading
noun🔗ShareA radio or television program counting down the top songs of a given week, usually in reverse order ending with the No. 1."The radio station's weekly countdown of the top songs was always a highlight of my commute. "mediaentertainmentmusicnumberChat with AIVocabulary GamePractice Reading
verb🔗ShareTo count down."We will countdown from ten to launch the model rocket. "timenumberactionChat with AIVocabulary GamePractice Reading
