human-to-human
UK[ˌhjuːmən tə ˈhjuːmən]US[ˌhjuːmən tə ˈhjuːmən]
adj
Involving or occurring between two or more human beings directly, without the use of an intermediary device or animal.
adj
(Of a disease) transmitted directly from one person to another.
Etymology
The word 'human' originates from the Latin humanus, which is related to homo (man). Humanus itself is derived from the Proto-Indo-European root dhghem-, meaning 'earth', highlighting the ancient concept of humans as 'earthly beings' as opposed to gods. The compound 'human-to-human' is a modern English formation, utilizing the basic preposition 'to' to denote a direct relationship or transmission path. This construction logically builds its meaning from its components: a connection or interaction that proceeds directly from one human being to another, emphasizing the absence of any non-human intermediary in the process.
Analysis
This is a compound adjective formed by the noun 'human' (from Latin humanus, meaning 'of or belonging to man') and the preposition 'to', repeated. The structure functions as a hyphenated modifier.
Examples
The workshop focuses on improving human-to-human communication skills.
Measles is a highly contagious human-to-human disease.
They advocated for a return to more human-to-human service instead of automated systems.