an answer or reaction

sent to someone in an envelope with a letter.

to suggest that someone or something would be good or suitable for a particular job or purpose.

something that you must do, or something you need.

to make something known generally or in public

having finished a training course, or having particular skills

 an official request for a job, a place on a course, etc., usually in writing.

the act of thinking about something carefully

Someone or something that is like that can be trusted or believed because he, she, or it works or behaves well in the way you expect