Word mod com/con
An initial 'con' may be rendered by 'com'
Syncope r => v.r
Syncopated perfect often drops the 'v' and contracts vowel
conputav.erat V 1 1 PLUP ACTIVE IND 3 S
conputo, conputare, conputavi, conputatus V (1st) TRANS [XSXBO]
reckon/compute/calculate, sum/count (up); take/include in reckoning; work out;
Syncope r => v.r
computav.erat V 1 1 PLUP ACTIVE IND 3 S
computo, computare, computavi, computatus V (1st) TRANS [XSXBO]
reckon/compute/calculate, sum/count (up); take/include in reckoning; work out;

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.