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; 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

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

“It’s a piece of my childhood that I get to now share with my kids and hopefully someday they’ll share with their kids if they stay in Redding.”

From Los Angeles Times • Apr. 7, 2026

The general consensus is that if we really want to put people on Mars someday, which will be exponentially more difficult, we have to start with the moon.

From Salon • Apr. 7, 2026

It is another challenge for Western automakers competing with Chinese rivals there and at home—and potentially in the U.S. someday.

From The Wall Street Journal • Mar. 17, 2026

Perhaps someday Tía Mazal will get her wish, and I will be a bride and then a mother.

From "Across So Many Seas" by Ruth Behar

Related Words

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