*según* as; according to
*segundo* second
*seguridad* f. security
*seguro* sure; true; *a buen ——* certainly
*seis* six
*selvático* wild
*sellar* seal; stamp; *papel sellado* paper or document stamped with the government seal so as to make it legal
*semana* f. week
*semejante* similar; such
*sencillo* simple