The term "adience" refers to the act of paying attention or listening attentively. However, there are several synonyms that can be used in place of this word. One alternative is "attentiveness", which reflects the state of being attentive or focused. Another synonym is "heed", which implies giving careful consideration or attention. Additionally, "concentration" can be used to describe the act of focusing one's attention on something. "Awareness" is another suitable synonym, signifying being conscious of or knowledgeable about something. Lastly, "perception" can convey the idea of attentiveness by capturing the ability to notice or be aware of stimuli.