Day one Meaning in English

expression

US

ˈdeɪ/ /ˈwən

DAY wuhn

UK

dˈeɪ/ /wˈɒn

DAY won

Definition

The moment when something starts or begins; often used to mean 'from the very beginning' of an activity, job, or relationship.

Usage & Nuances

Most often informal; appears in phrases like 'from day one'. Emphasizes loyalty, continuity, or the immediate start of something. Can be literal (first day) or figurative (the beginning of an experience or process). Often signals commitment or history.

• Spanish: primer día - desde el principio
• Portuguese (BR): primeiro dia - desde o início
• Portuguese (PT): primeiro dia - desde o início
• Chinese (Simplified): 第一天 - 一开始
• Chinese (Traditional): 第一天 - 一開始
• Hindi: पहला दिन - शुरुआत से
• Arabic: اليوم الأول - منذ البداية
• Bengali: প্রথম দিন - শুরু থেকেই
• Russian: первого дня - с самого начала
• Japanese: 初日（しょにち） - 最初から
• Vietnamese: ngày đầu tiên - từ lúc bắt đầu
• Korean: 첫날 - 처음부터
• Turkish: ilk gün - en başından
• Urdu: پہلے دن - ابتدائی وقت سے
• Indonesian: hari pertama - sejak awal

Example Sentences

I have loved swimming since day one.

basic

From day one, she did her best at work.

basic

He knew the answer on day one of class.

basic

We've been friends since day one.

natural

She trusted me right from day one.

natural

It was clear this job would be tough from day one.

natural