A philosophical or psychological tendency to act, think, or behave in a childlike or infantile manner.
From 'baby' combined with the suffix '-ism' (Greek '-ismos'), which typically denotes a system, practice, or condition. This follows the pattern of creating ideological or behavioral terms like 'realism' or 'cynicism'.
The '-ism' suffix transforms 'baby' into something more serious—suggesting not just one babyish act but an entire lifestyle or worldview! It's the linguistic difference between being silly once and making childishness your whole personality.
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