To cause to happen; cause a chemical reaction.

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

Touching or feeling something. state of touching. To get in touch with someone.

To keep something from spreading.

in particular place. Gift. To introduce someone to others.

Revealing; exposing the truth. To report something to an authority.

To be evidence/an indication something will happen.

having resemblance in appearance, character, or quantity. person or thing similar to another.

set of railway vehicles forming train. be composed of.

For a reason.

Used to add new (often different) information.

organ or cell able to respond to light, heat, or other external stimulus. A nerve ending that changes stimuli into impulses.

made up from several elements. Closed walled area, as in a prison. To make a mistake or problem worse.

verbal written or recorded communication. Pieces of information that are told/given to someone. To communicate using text.

gesture, action, or sound that is used to convey information or instructions. Road-side lights that direct traffic to go or stop. To send a message using your hands or other means.