Match the definition with the word.the act of declaring something aggressivelyassertionclamorvigilfrugality

Step 1: Break Down the Problem

We need to match each word with its correct definition based on the provided options.

Step 2: Define the Words

1. Assertion: A confident and forceful statement of fact or belief.
2. Clamor: A loud and confused noise, especially that of people shouting.
3. Vigil: A period of keeping awake during the time usually spent asleep, especially to keep watch or pray.
4. Frugality: The quality of being economical with money or food; thriftiness.

Step 3: Match Definitions

• "The act of declaring something aggressively" aligns with Assertion, as it pertains to making a confident statement, often with emphasis.

Step 4: Verify and Summarize

The word that fits the definition "the act of declaring something aggressively" is Assertion. The other words do not match this definition as clearly.

Final Answer

Assertion is the word that matches the definition "the act of declaring something aggressively."