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sermonize
sero-
seroconvert
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serology
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serious-minded
se·ri·ous-mind·ed


adjective 
Definition:
 
not frivolous: earnest and taking an interest in matters that are weighty and important
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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