IPA: /əˈtɛnʃənl/
KK: /əˈtɛnʃənl/
Relating to the ability to focus or pay attention to something.
The attentional skills of the students improved after the training.
Attentional is formed from "attentio" (from Latin, meaning attention) and the suffix "-al" (meaning relating to). The word "attentional" refers to something that is related to or characterized by attention.
Think of 'attention' as the focus on something, and the '-al' means relating to, so 'attentional' describes anything that relates to attention.