rejoice
懌 centers on a heartfelt, joyful response: to rejoice or feel gladness from within.
懌 combines the heart radical 忄 with 睪, which likely contributes the sound and may carry a sense of ease or release, together suggesting inner joy.
The heart radical 忄 beside 睪 (a shape associated with release or ease) suggests a heart that feels light and free — the feeling of rejoicing.
For エキ, imagine a joyful person exclaiming 'Eki!' as they rejoice: the sound 'Eki' cues エキ, and the heart 忄 fills with gladness.