doing good, performing kind deeds ...1535 obs.
from Latin beneficium (benefit, kindness, favour) + -ous
FIRST DOCUMENTED USE
1535 - see EXAMPLE below
"...Finally, his good and gentle manner is all full of pleasure and comfort so kind, so friendly, so liberal and beneficious, so piteous and merciful, so ready in all opportunities, so mindful and circumspect, so dulcet and sweet in communication..."
From: A Reading from a treatise The Ways to Perfect Religion, written in the Tower of London by John Fisher for his sister, Elizabeth, in 1535, shortly before his execution.
- Bishop John Fisher