observer
UK[əbˈzɜːvə]US[əbˈzɜːrvər]
n
a person who watches or notices something, especially in a formal or scientific context.
n
a person who attends a meeting, event, or activity to listen and watch but not to participate.
Morpheme Breakdown
ob
serv
er
ob
toward, against, in the way of
serv
to keep, watch, guard, preserve
er
a person or thing that does something
Etymology
The word 'observer' is built upon the Latin verb 'observare', meaning "to watch, heed, guard, or comply with." This verb itself is a compound of the prefix 'ob-' (meaning "in front of, toward") and 'servare' (meaning "to keep, watch, guard"). The literal sense is "to watch over" or "to keep in view." The English agent suffix '-er' was added to form a noun for "one who watches." Over time, the meaning evolved from a general sense of watching to its modern, more specific applications, such as a non-participant witness or a person engaged in scientific or military monitoring.
Analysis
Structure: ob + serv + er
- ob: Latin origin, a prefix meaning "toward, against, in the way of".
- serv: Latin origin, from the root meaning "to keep, watch, guard, preserve".
- er: Old English origin, an agent noun suffix meaning "a person or thing that does something".
Examples
The UN sent a team of observers to monitor the ceasefire.
As a keen observer of human behavior, she noticed the subtle change in his expression.
The astronomer spent the night as an observer at the telescope, recording data.