Declare (verb)

1. To make known publicly; announce.
2. To state firmly or publicly; affirm.
3. To make known the meaning of (a word or phrase).
4. To state as a fact; assert.
5. To show or prove clearly.

Origin:

Middle english declaren, from old french declarer, from latin declarare, from de- + clarare to make clear.

Examples:

1. The mayor declared a state of emergency.
2. He declared his love for her.
3. The judge declared the evidence inadmissible.
4. She declared that she would run for office.
5. The results of the experiment declare the hypothesis to be false.