adsum
/ˈadsʊm/ /ˈadsʌm/Now rare
exclamation
‘I am here’ (used to indicate the speaker is present). Hence as noun: this statement as an answer in a roll-call, etc.
Origin
Late 16th century; earliest use found in Taming of a Shrew. From classical Latin adsum, 1st singular present indicative of adesse to be present.