When you count , you say all the numbers one after another up to a particular number.

If you say and counting after a number or an amount of something, you mean that the number or amount is continuing to increase .

excluding

a room or building used by the accountants of a business

→ natural number

If you tell someone to count you in , you mean that you want to be included in an activity.

If you count on something or count upon it, you expect it to happen and include it in your plans .

to count ( votes , etc) again

a building, room , or office used for keeping books and transacting business

If you count out a sum of money, you count the notes or coins as you put them in a pile one by one.

If something counts against you, it may cause you to be rejected or punished , or cause people to have a lower opinion of you.

If something counts towards or counts toward an achievement or right , it is included as one of the things that give you the right to it.

A countdown is the counting aloud of numbers in reverse order before something happens , especially before a spacecraft is launched.