| o'clock |
O'clock means "of the clock," and it is a word we use when we are talking about a particular time of the day, especially an exact hour of the day, such as eight in the morning, three in the afternoon, or six in the evening. |
| October |
October is the tenth month of the year. |
| octopus |
An octopus is an animal that lives in the sea. It has a soft body and eight long "arms." These arms help the octopus move through the water and catch food. Octopuses eat crabs, lobsters, and other small sea animals. |
| odd |
When something is odd, it is different from what is expected or usual. It is strange. [2 definitions] |
| odd number |
An odd number is a number that can't be divided exactly by two. Three, five, seven, and nine are some of the odd numbers. |
| of |
We often use of when we are talking about something belonging to or being connected with a person or thing. The name of your family, is your family's name. The sister of your mother is your mother's sister. [8 definitions] |
| off |
When something has come off, it is not attached to some surface anymore. If your bandage has come off, it is not lying against your skin anymore. [7 definitions] |
| offer |
When you offer something to someone, you present it to them and see if they want it or not. If you want to give your dog a treat and you show it to him in your hand, you are offering the treat to him. |
| office |
An office is a place where people work. In an office, there are usually desks, computers, and telephones. [2 definitions] |
| office building |
An office building is a place where many people work. An office building can be used by one business or by many different businesses. In an office building, most people work at desks and computers. |
| officer |
An officer is a person who has an important position in a company or in a government. An officer has some power over other people and a lot of responsibility. The president of a company is that company's top officer. A mayor is the top officer in the government of a city. [2 definitions] |
| often |
When you do something often, you do it a lot. If you go swimming often, maybe you go every day or every week. Also, if someone asks you how often you do something, they want to know how many times you do it. |
| ogre |
In fairy tales, an ogre is an ugly giant who is very scary and cruel. |
| oh |
Oh is something we often say without thinking. It doesn't have any real meaning, but we often say it when we are surprised or when we have some strong feeling. Sometimes we say it when someone tell us a thing that we didn't know before. |
| Ohio |
Ohio is one of the fifty states that make up the United States of America. A short way to write Ohio is OH. |
| oil |
Oil is a special, slippery liquid that comes from the inside of certain natural things. Some kinds of oil come from the fat of animals and plants. We can eat these oils, and they are often used in cooking food. Potatoes are often cooked in oil, for example. Some kinds of oils come from minerals or are made from chemicals. We can't eat these oils. They are often used in products for cleaning, polishing, making your skin feel soft, and many other kinds of things. [2 definitions] |
| OK1 |
When something is OK, there is nothing wrong with it. It is good, or it is good enough. [2 definitions] |
| okay |
Okay is another way to write OK. When something is OK, there is nothing wrong with it. It is good, or it is good enough. |
| Oklahoma |
Oklahoma is one of the fifty states that make up the United States of America. A short way to write Oklahoma is OK. |
| old |
When someone is old, it means that they have lived for many years. If a thing is old, it has existed for a long time. [2 definitions] |
| old-fashioned |
When something is old-fashioned, it looks like or seems like something from the past. If something is old-fashioned, it doesn't seem new and modern. |