| Ontario |
Ontario is one of the ten provinces of Canada. A province is an area of land that is one part of a country. Each province has its own capital. |
| onto |
When one thing goes onto another thing, it goes from one place to the top or surface of something else. |
| open |
When something is open, like a door or a window, something can come through it. When something like a box or drawer is open, you can see the inside. You can put things in or take things out. When something is open, it is not closed or shut. [4 definitions] |
| opening |
An opening is a hole or empty space where something can get through. A window is an opening in a wall. |
| operate |
When you operate something, you make it run and you control it. We operate things like trucks, cars, electric tools, computers, and other machines. [3 definitions] |
| operation |
When a doctor does an operation, it means that the doctor opens a part of someone's body to fix something that is wrong with it. [3 definitions] |
| opinion |
An opinion is what you think about something or someone. |
| opossum |
An opossum is a small animal with gray fur, a pointed nose, and a long tail. It uses its long tail to hang from tree branches. A mother opossum carries her babies in a kind of pocket in her belly. Different kinds of opossums are found in Australia and North and South America. |
| opportunity |
An opportunity is a chance to do something or to make something better. |
| opposite |
If things are opposite, they are as different as they can be. Happy and sad are opposite feelings. Fast and slow are opposite speeds. East and west are opposite directions. [4 definitions] |
| or |
When you can have ice cream or cake, it means that you have a choice between ice cream and cake. |
| orange |
An orange is a round, sweet fruit. We often drink the juice of oranges in the morning. Oranges grow on trees in warm places. [3 definitions] |
| orchard |
An orchard is a piece of land planted with trees that grow fruits or nuts. |
| orchestra |
A group of people who play music together on different instruments is called an orchestra. Very often, an orchestra is large and includes many people who play violins and other instruments with strings. |
| order |
An order is a way that a group of things are put together. When we count, we always say numbers in a certain order. We say "one, two, three, four, five." We never say something like "three, five, one, two, four" when we count. When things are in an order, we can see some pattern or reason that things are put together in a certain way. [3 definitions] |
| ordinary |
Ordinary means usual or normal. If your ordinary way of walking is fast, then walking fast is normal for you. It is what you usually do. When something is not ordinary, it is may be strange or different. |
| Oregon |
Oregon is one of the fifty states that make up the United States of America. A short way to write Oregon is OR. |
| organization |
When your desk has organization, it means that your desk is in order. Everything is arranged in a way that is neat and makes sense. [2 definitions] |
| organize |
When you organize your room, it means that you put your room in order or arrange it in a certain way. |
| Orinoco River |
The Orinoco River is a long and important river in South America. It is mostly in the country of Venezuela. It flows across Venezuela in the south and then flows along the border between Venezuela and Colombia. Finally, it flows into the Atlantic Ocean. |
| ornament |
An ornament is something you put on something else to make it prettier to look at. |