Work that a person does to assist others. To maintain a piece of machinery so it runs well.

systematic computational analysis of data or statistics. .

possessing or involving detailed knowledge or study of restricted topic. Person who works in one specific area or field.

Fact of increasing; amount something grows by. To make or become larger in size or amount.

self-confident, level-headed, or well organized. In the same place; not far in a family or group.

Being in working condition and ready to be used.

better, greater, or otherwise different from what is usual. Heavily discounted sales item.

To become a member of.

Task often considered difficult or challenging.

relating to nucleus of atom.

place where passenger trains stop on railway line. put in or assign to specified place for particular purpose.

Making a negative judgment of something.

on condition or understanding that. To offer or give something that is wanted, needed.

set of things working together as parts of mechanism. Sets of organized planned ideas that work together.

capacity for accurate and deep understanding. Very good understanding of some things.