decorum
UK[dɪˈkɔːrəm]US[dɪˈkɔːrəm]
n
Correct and socially acceptable behavior, manners, and appearance, especially in a formal situation.
Morpheme Breakdown
decor
um
decor
proper, fitting
um
noun suffix
Etymology
The word decorum entered English in the 16th century, directly from Latin 'decorum', meaning 'that which is proper or fitting'. The Latin noun derives from the adjective 'decorus' (becoming, fitting, proper), which itself comes from the verb 'decēre', meaning 'to be fitting or suitable'. This verb is traced back to the Proto-Indo-European root dek-, meaning 'to take, accept', which also gave rise to words like 'decent' and 'dignity'. Thus, the core logic of decorum evolved from the ancient concept of 'acceptability' to the specific modern sense of socially prescribed propriety and dignified conduct.
Analysis
Structure: decor (proper, fitting) + um (noun suffix)
decor (Latin origin, meaning 'proper, fitting, seemly'); um (Latin neuter noun suffix).
Examples
The ambassador conducted herself with great decorum during the state dinner.
Students are expected to observe proper decorum in the lecture hall.
His lack of decorum at the formal ceremony shocked the other guests.