Where does “dedicational” come from?

dedicational (English) comes from English dedication, from Middle English dedicacioun, from Old French dedicacion, from Latin dedicatio, from Latin dēdicō, from Latin dīcō, from Latin -tiō, from Latin dissertātiō — small stone, pebble; gravel, rubble.

Ancestry of “dedicational”, step by step

dedicational traces back through two separate lines of ancestry.

via English dedication

StepLanguageWordMeaning
1EnglishdedicationThe act of dedicating or the state of being...
2Middle Englishdedicacioun
3Old Frenchdedicacionconsecration of a church or chapel
4Latindedicatiodedication, consecration
5Latindēdicōto dedicate, consecrate
6Latindīcōto say, talk, speak, utter, mention
7Latin-tiōtion, -ation, -ing
8Latindissertātiō(spoken) dissertation, discourse, disquisition
9Latindissertusarranged, disposed; explained
10Latindissereresecond-person singular future passive indicative...
11Latindis-asunder, apart, in two; reversal, removal;...
12Latincalceusshoe
13Latincalxlimestone; chalk; the finish line
14Ancient Greekχάλιξsmall stone, pebble; gravel, rubble

via English AL

StepLanguageWordMeaning
1EnglishALInitialism of assembly language; Initialism of...
2Dutchalall, all of; already; yet
3Middle Dutchalall, all of; completely; even though, no matter...
4Old Dutchāl
5Proto-West Germanicallall
6Proto-Germanicallazall
7Proto-Indo-Europeanh₂él-to grow, nourish
Every word from Ancient Greek χάλιξEvery word from Latin -tiōEvery word from Latin dis-