IPA: /ɪkˈspɛrɪmɛntəli/
KK: /ɪkˈspɛrɪˌmɛntəli/
In a way that relates to testing or trying out new ideas or methods to see how they work.
The new drug was tested experimentally before being approved for public use.
Experimentally → It is formed from "experiment" (from Latin *experimentum*, meaning a trial or test) and "-ally" (meaning in a manner relating to). The word "experimentally" means in a manner relating to a trial or test.
Think of conducting a 'trial' ('experiment') and doing it 'in a manner' ('-ally') that relates to testing. This helps you remember that 'experimentally' refers to how something is done in a testing way.