A thing of any kind.

having acquired much knowledge through study. To get knowledge or skills by study or experience.

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

action of mentioning or alluding to something. A letter of recommendation, e.g. for a job. To cite a piece of research in speech or writing.

Medical; a small parts in a cell that help your body to turn food into energy.

To use instead of something else.

preferred to all others of same kind. A thing that someone likes best or enjoys most. record address of website or other data.

Being what was wanted or needed. used to greet someone in polite or friendly way. Friendly greeting to someone who has arrived. To accept or receive something happily and gladly.

To make clear or easy to understand by describing.

isolated person or thing. To separate something from another substance.

systematic investigation into and study of materials and sources. To study in order to discover new ideas and facts.

action or process of creating.

circumstances that form setting for event, statement, or idea.

faculty of remembering. Some things that has been remembered.

used for emphasis with following adjective functioning as adverb. thing that is unspecified or unknown.