Person's opinion about something. To have an idea about something without certainty.

Set of changes that occur slowly and naturally. To convert by putting something through a machine.

To any extent or degree (often used with not). Use to indicate limits or variation. any place.

breed plants or animals by natural processes.

as great as possible or permitted. at most. greatest amount.

Main idea or theme in a story, book, or film. To communicate using text.

Used to add new (often different) information.

not same as another or each other.

Test performed to assess new ideas or theories. To try something new that you haven't tried before.

person who is trained to travel in spacecraft. Person who travels in space.

action or process of spinning. To feel dizzy / confused / light headed.

Part of a piece of music.

of no value. not at all. Number or value of zero. not anything.

Of the top layer; not deep or meaningful. outside part or uppermost layer of something. rise or come up to surface of water or ground.

course along which person or thing moves.