1 9 6 3 ) ▁ ▁References ▁ ▁Category : Lat in ▁legal ▁termin ology ▁Category : Common ▁law ▁rules ▁Category : Qu ot ations ▁from ▁law <0x0A> </s> ▁Act us ▁prim us ▁is ▁a ▁technical ▁expression ▁used ▁in ▁sch ol astic ▁philosophy . ▁▁ ▁The ▁Latin ▁word ▁act us ▁means ▁determ ination , ▁complement . ▁In ▁every ▁being ▁there ▁are ▁many ▁actual ities , ▁which ▁are ▁sub ordin ated . ▁Thus ▁existence ▁supp oses ▁ess ence ; ▁power ▁supp oses ▁existence ; ▁action ▁supp oses ▁fac ulty . ▁The ▁first ▁actual ity ▁( act us ▁prim us ) ▁begins ▁a ▁series ; ▁it ▁supp oses ▁no ▁other ▁actual ity ▁preceding ▁it ▁in ▁the ▁same ▁series , ▁but ▁calls ▁for ▁a ▁further ▁complement , ▁namely , ▁the ▁second ▁actual ity ▁( act us ▁sec und us ). ▁▁ ▁But ▁as ▁the ▁same ▁reality ▁may ▁be ▁called ▁" actual ity " ▁when ▁viewed ▁in ▁the ▁light ▁of ▁what ▁preced es , ▁and ▁" pot ential ity " ▁when ▁viewed ▁in ▁the ▁light ▁of ▁what ▁follows ▁( see ▁act us ▁et ▁pot ent ia ), ▁the ▁meaning ▁of ▁the ▁term ▁" first ▁actual ity " ▁may ▁vary ▁according ▁to ▁the ▁view ▁one ▁takes , ▁and ▁the ▁point ▁where ▁the ▁series ▁is ▁made ▁to ▁begin . ▁Primary ▁matter ▁( see ▁matter ▁and ▁form ) ▁is ▁a ▁pure ▁potential ity , ▁and ▁the ▁substantial ▁form ▁is ▁its ▁first ▁determ ination , ▁its ▁first ▁actual ity . ▁The ▁complete ▁subst ance ▁constit uted ▁by ▁these ▁two ▁principles ▁receives