Two words            
May be 2 words combined (certa+rebamur) If not obvious, probably incorrect
cert.a               N      2 2 NOM P N                 
cert.a               N      2 2 VOC P N                 
cert.a               N      2 2 ACC P N                 
certum, certi  N (2nd) N   [XXXBO]  
that which is fixed/regular/definite/specified/certain/fact/reliable/settled;
cert.a               V      1 1 PRES ACTIVE  IMP 2 S    
certo, certare, certavi, certatus  V (1st)   [XXXAO]  
vie (with), contest, contend/struggle (at law/politics), dispute; fight, strive
cert.a               ADJ    1 1 NOM S F POS             
cert.a               ADJ    1 1 VOC S F POS             
cert.a               ADJ    1 1 ABL S F POS             
cert.a               ADJ    1 1 NOM P N POS             
cert.a               ADJ    1 1 VOC P N POS             
cert.a               ADJ    1 1 ACC P N POS             
certus, certa -um, certior -or -us, certissimus -a -um  ADJ   [XXXAO]  
fixed, settled, firm; certain; trusty/reliable; sure; resolved, determined;
r.ebamur             V      2 1 IMPF         IND 1 P    
reor, reri, ratus sum  V (2nd) DEP   [XXXAX]  
think, regard; deem; suppose, believe, reckon;
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