excus.are V 1 1 PRES ACTIVE INF 0 X
excus.are V 1 1 PRES PASSIVE IND 2 S Early
excus.are V 1 1 PRES PASSIVE IMP 2 S
excuso, excusare, excusavi, excusatus V (1st) TRANS [XXXAO]
excuse/justify/explain; make excuse for/plead as excuse; allege; absolve/exempt
Syncope r => v.r
Syncopated perfect often drops the 'v' and contracts vowel
excusav.ere V 1 1 PERF ACTIVE IND 3 P
excuso, excusare, excusavi, excusatus V (1st) TRANS [XXXAO]
excuse/justify/explain; make excuse for/plead as excuse; allege; absolve/exempt

Credits:
This, our local install of the popular standby Whitaker's Words, is possible thanks to the resurrection of the venerable project at William Whitaker's Words, where you will also find extensive documentation. The corresponding GitHub repository is where you can submit issues about missing forms and analyses.
This web interface by Walter M. Shandruk.