IPA: /ˌɒbzəˈveɪʃənəli/
KK: /ˌɑːbzərˈveɪʃənəli/
In a manner that involves watching or observing something carefully to gather information or data.
The scientists studied the behavior of the animals observationally to understand their social interactions.
Observationally → It is formed from "observare" (Latin, meaning to watch or pay attention) and the suffix "-ly" (meaning in a manner of). The word "observationally" means in a manner that relates to watching or observing.
Think of the act of 'watching' ('observare') and how doing so can be described as a way of doing something ('-ly'). This helps you remember that 'observationally' refers to the manner of observing.