'user-centeredly' originates from Modern English, specifically formed from the adjective 'user-centered' + the adverbial suffix '-ly', where 'user' meant 'a person who uses something' and '-ly' meant 'in the manner of'.

'user-centeredly' changed from the adjective 'user-centered' (also spelled 'user-centred' in British English), which was formed from 'user' + the past-participle-based adjective 'centered' (from 'center'), and it eventually became the adverb 'user-centeredly' in technical usage in design and human-computer interaction in the late 20th century.

Initially, 'centered' often referred to literal placement at a center; over time it developed a figurative sense of 'focused on' or 'prioritizing', so 'user-centeredly' came to mean 'in a manner that prioritizes the user' rather than 'literally placed at the center'.