someday

American  

[suhm-dey] / ˈsʌmˌdeɪ /

adverb

1. at an indefinite future time.

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someday British  

/ ˈsʌmˌdeɪ /

adverb

1. at some unspecified time in the (distant) future

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Spelling

The adverb someday is written solid: Perhaps someday we will know the truth. The two-word form some day means “a specific but unnamed day”: We will reschedule the meeting for some day when everyone can attend.

Etymology

Origin of someday

before 900; Middle English sum day, Old English sum dæg; see some, day

Explanation

The adverb someday means eventually or at some point in the future. So if you plan to visit Sri Lanka someday, you'd like to do it but you don't know exactly when it will happen. Use the word someday when you can't be specific about when something will occur. If you're not sure when you'll next see your friend who's moving to Alaska, you can say, "I'll visit you someday soon!" And if you keep planning to make homemade bread but never get around to it, you might promise yourself you'll do it someday.

Example Sentences

Scientists studying axolotls, zebrafish, and mice have uncovered a shared set of genes that could someday help researchers develop therapies for regrowing human limbs.

From Science Daily • May 9, 2026

Just as the smartphone supplanted PCs as people’s main computing device, someday something will replace it.

From Barron's • Apr. 24, 2026

The public has an expectation that someday we will have the ability to walk into a museum and see this stuff.

From Slate • Apr. 9, 2026

Practicing in the terrain they could someday have to defend, British soldiers also learned practical lessons like how quickly a drone battery drains and how slowly it charges in frigid weather.

From The Wall Street Journal • Apr. 7, 2026

And I wanted to prove myself to Mr. Pinkerton, too, so he’d see that I could turn into a great detective someday.

From "The Detective's Assistant" by Kate Hannigan

Related Words

• finally
• one day
• sometime
• sooner or later
• subsequently
• ultimately