The word "first day" in English means: The first day of a period of time, especially at a new job or school., The beginning or start of something significant..
The phonetic transcription of "first day" is /ˌfɜːst ˈdeɪ/ in British English and /ˌfɜːrst ˈdeɪ/ in American English. Click the 🔊 button to hear both pronunciations.
Synonyms for "first day": beginning, start, outset.
Example usage of "first day": "I was so nervous on my first day at school.". More examples on the page.