Question

when we speak of a word's additional, suggestive meaning, we are talking about its_____.

Answer 1

The word's connotation. 
(The additional meaning of a word, other than it's literary definition.) 

Answer 2

Answer:

Connotation.

Explanation:

Words have one primary meaning which is often called literal meaning and then there is an idea or feeling which the word invokes aside from the literal meaning.

That is what is called connotation, the meaning of the word is shaped by cultural or emotional associations, so if you take out of context the sentence could be misunderstood.

I hope this answer helps you.