1. to say something in a serious or official way
2. to officially announce or make known publicly
3. to state that you have something that must be reported to customs or tax authorities
Usage: legal/customs context

Examples

• The president will declare a national emergency.
• She declared her love for him.
• The judge declared the defendant guilty.
• You must declare all income on your tax return.
• The country declared independence in 1776.
• He declared his intention to run for office.
• Do you have anything to declare at customs?