Resonant means deep and ringing, and lingering in the air. A resonant voice, a resonant phrase, deeply resonant.
The figurative sense is the commoner: a resonant phrase is one that keeps sounding in the mind afterwards. In physics a resonant frequency is the one at which something vibrates most readily, which is where the image comes from.
1adjectiveresonantDeep and ringing, and lingering in the air.
“The singer's deep, resonant voice filled the old church.”
resonant is a quality.
Latin resonare means to sound again, from re- plus sonare, to sound.
Latin
resonāns
French
résonnant
English, today
resonant
French résonnant or Latin resonāns.
Etymology from Wiktionary, CC BY-SA