Ou-symbelness

According to the Old English Dictionary:

e;

ou-symbelness

f. A solemn festival:--Mið ðý heó geségon ðone biscop mæssan (mæssena, MS. B.) onsymbelnesse mǽrsian (celebratis missarum sollemniis), Bd. 2, 5; S. 507, 12. ou-symbelness