Realize
verbBase realize · Past realized · Past Participle realized · Present Participle realizing · 3rd person realizes
Definition
1. (verb) To suddenly understand or become aware of something — a moment when something clicks in your mind.
2. (verb) To achieve or make something real — to turn a dream, goal, or plan into reality.
2. (verb) To achieve or make something real — to turn a dream, goal, or plan into reality.
Context Alive
You're halfway through your commute when you feel your pockets and your stomach drops. Your wallet isn't there. You check your bag — nothing. Then you realize you left it on the kitchen table next to your coffee. You can picture it sitting there. It's too late to go back, so you spend the rest of the day borrowing money from colleagues and promising to pay them back tomorrow.
Meanings
2 meanings 1 To Suddenly Understand or Become Aware (Verb) Very Common ▼
This meaning is about a moment of awareness — when something suddenly becomes clear in your mind that you didn't know or notice before. Imagine being at a party and chatting happily with everyone, and then you look at your phone and realize it's 2am — you had no idea so much time had passed. This is describing that click in your brain when a fact, truth, or situation hits you. You might say "I didn't realize how late it was" when time passed faster than you expected, or someone could say "she realized he was lying when his story kept changing" about the moment someone saw through a lie. Or think about studying abroad and slowly realizing how much you miss home — it's not sudden, but the awareness grows until you can't ignore it. The word suggests a shift from not knowing to knowing.
✏️ Realize is often confused with "understand" by learners, but they're different. "Understand" means you get the meaning of something. "Realize" means you become aware of something — often something that was true all along but you didn't notice. "I understand the rules" vs. "I didn't realize the deadline was today." British English spells it realise — both spellings are correct.
2 To Achieve or Make Something Real (Verb) Common ▼
This meaning is about turning something abstract — a dream, a plan, an ambition — into reality. Imagine someone who always dreamed of opening a bakery. After years of saving money, learning to bake, and finding the right location, they finally open the doors — they've realized their dream. This is describing the moment when a goal stops being just an idea and becomes something real and tangible. You might read "she realized her ambition of becoming a doctor" about someone who achieved a lifelong goal, or someone could say "the project was never fully realized due to lack of funding" about a plan that never became reality. Or think about an architect whose designs are finally being built — they're seeing their vision realized in bricks and glass. The word suggests completion — the gap between dream and reality has been closed.
✏️ This meaning is more formal and slightly literary. In everyday conversation, people usually say "achieve" or "make it happen" instead. But "realize a dream" and "realize an ambition" are classic, powerful combinations. You'll see this meaning in news, biographies, and formal writing. The noun form for this meaning is realization: "the realization of her lifelong dream."
Common Patterns
Basic Structures
realize (that) + clause → the most common pattern — becoming aware of a fact or situation
I suddenly realized that I'd been walking in the wrong direction for twenty minutes.
realize + question word (how/what/why) → becoming aware of the answer to an unspoken question
She didn't realize how much the trip would cost until she started booking.
realize a dream / ambition / goal → to achieve something you've wanted for a long time
He finally realized his dream of climbing Everest at the age of 55.
Common Structures
not realize → being unaware of something — very common in negative form
I didn't realize you were waiting — I'm so sorry.
come to realize → gradually becoming aware of something over time
Over the years, she came to realize that money wasn't everything.
make someone realize → causing someone to become aware of something
Travelling alone made me realize how independent I could actually be.
Collocations
10 collocationssuddenly realize
to become aware of something in an instant
quickly realize
to become aware of something very soon after starting
come to realize
to gradually become aware of something over time
fail to realize
to not notice or understand something important
realize a dream
to achieve a long-held ambition
realize the importance of
to understand how important something truly is
realize a mistake
to become aware that you've done something wrong
realize the truth
to finally see what's really going on
fully realize
to completely understand or achieve something
not even realize
to be completely unaware — emphasises surprise
Example Sentences
10 examples
1
I didn't realize you were standing behind me — you scared me!
I had no idea you were right behind me — you gave me a fright!
2
She realized too late that she'd sent the email to the wrong person.
By the time she noticed the email had gone to the wrong person, it was already too late.
3
It took him years to realize that the job was making him unhappy.
He spent years in the role before he finally understood it was draining his happiness.
4
Do you realize how lucky you are to have a family like that?
Are you aware of how fortunate you are to have such a supportive family?
5
After the accident, he realized the importance of wearing a seatbelt.
The accident made him understand just how vital it is to buckle up.
6
She realized her lifelong ambition of becoming a published author at 62.
At 62, she finally achieved her dream of having a book published.
7
I came to realize that being busy doesn't mean being productive.
Over time, I understood that filling your day with tasks doesn't mean you're actually getting things done.
8
He didn't even realize he was speaking French until someone pointed it out.
He was completely unaware that he'd switched to French until someone mentioned it.
9
Living abroad made me realize how much I took my home country for granted.
Being in another country showed me that I never appreciated my own country enough.
10
The plan was ambitious but never fully realized due to budget cuts.
The plan was bold but was never completely carried out because the funding was reduced.
Synonyms & Antonyms
6 items
Synonymsnotice
more about seeing or detecting — less about the mental 'click'
recognize
similar but implies identifying something familiar, not discovering something new
achieve
works for the 'make real' meaning — more common in everyday speech
Antonymsoverlook
to miss or fail to notice something — the opposite of becoming aware
ignore
to deliberately not pay attention — choosing not to realize
miss
to fail to notice or understand something