secular (adj.)

Old English seonowe, oblique form of nominative sionu "sinew," from Proto-Germanic *sinwō (source also of Old Saxon sinewa, Old Norse sina, Old Frisian sine, Middle Dutch senuwe, Dutch zenuw, Old High German senawa, German Sehne), from PIE root *sai- "to tie, bind" (source also of Sanskrit snavah "sinew," syati, sinati "to bind;" Avestan snavar, Irish sin "chain;" Hittite ishai-/ishi- "to bind").

Old English sawan "to scatter seed upon the ground or plant it in the earth, disseminate" (class VII strong verb; past tense seow, past participle sawen), from Proto-Germanic *sean (source also of Old Norse sa, Old Saxon saian, Middle Dutch sayen, Dutch zaaien, Old High German sawen, German säen, Gothic saian), from PIE root *sē- "to sow," source of semen, season (n.), seed (n.). Figurative sense was in Old English.