involving existence of human life.

To guard a place or people; protect child, etc..

Concerning the sky or objects in the sky.

Unusual; hard to understand or work out.

person or thing that is being discussed, described, or dealt with. Areas of study at school, e.g. math, history. To cause to suffer or experience something.

intellectual and practical activity encompassing systematic study of structure and behaviour of physical and natural world.

Ceremony for religious purposes. To help or do work for someone, e.g. in a store.

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

instance of structure collapsing. To fold (e.g. a stroller) down to make it smaller.

Someone who brings.

To take part in a religious service.

attractive force.

Happening frequently or without pause. unchanging situation.

in central or primary respects.

relating to or making use of form of tape transport, used mainly to provide backup storage. method of relaying data over computer network as steady continuous stream. To split classes or students into ability levels.