To use instead of something else.

Without question; beyond doubt.

Whether it is raining, sunny, cold etc. outside. To erode or become damaged due to the environment.

At a time you choose, it's not important when.

Showing a strong desire to do or get something. preoccupy or fill mind of someone continually and to troubling extent.

Being what was wanted or needed. used to greet someone in polite or friendly way. instance or manner of greeting someone. To accept or receive something happily and gladly.

not operating normally or properly.

Only at certain times; occasionally.

not same as another or each other.

flowing naturally or supplied to building through pipes and taps. action or movement of runner. To operate or drive something.

Powerful, positive excitement and interest.

in space separating things. In the space that separates two objects.

calculation or estimate of future events. To predict some future thing, e.g. the weather.