IPA: /əˈtɛn.tɪv.nəs/
KK: /əˈtɛntɪvnəs/
The quality of paying close attention to something or someone.
Her attentiveness during the meeting helped everyone stay focused.
Attentiveness is formed from "attentus" (from Latin, meaning attentive or focused) and the suffix "-ness" (meaning the state or quality of). The word describes the state of being attentive or focused on something.
Think of being 'focused' ('attentus') on something, and the '-ness' indicates the quality of that focus. This helps you remember that attentiveness means the quality of being attentive.