1、muni- + fic- + -ence.
2、literally "present-making, gift-making".
3、=> generous, bountiful.
4、解读:gift or present make for sb.
英文词源
munificence (n.)
early 15c., from Middle French munificence, from Latin munificentia "bountifulness, liberality, generosity," from stem of munificus "generous, bountiful, liberal," literally "present-making," from munus "gift or service, duty, office" (see municipal) + unstressed stem of facere "to do" (see factitious).