/diːm/
[verb] To consider or judge something to be true or to have a particular quality. For example, if you deem something necessary, you believe it is needed.
Deem and doom share the same ancient root — once upon a time, to judge something was to seal its fate.
The word 'deem' is one of the oldest verbs in the English language, stretching back to the Old English word 'dēman', which meant to judge, to consider, or to form an opinion. This was not a casual or private kind of thinking — in the early Germanic world, to 'deem' something was a serious, often public act of assessment. The word carried real weight, the kind associated with councils, legal decisions, and the pronouncements of elders.
Old English 'dēman' descended directly from the Proto-Germanic root '*dōmijaną', which meant to judge or to set in order. That same root gave rise to the noun '*dōmaz', meaning judgment or law. From this single ancient source, two very different-looking English words grew side by side: 'deem', which kept the sense of forming a judgment in the mind, and 'doom', which took the darker path — the judgment that cannot be escaped. Both words are, in their deepest roots, the same idea.
The connection reaches even further back. Proto-Germanic '*dōmaz' is linked to the Proto-Indo-European root '*dheh₁-', meaning to set, to place, or to establish. This ancient root is astonishingly productive — it also gave Greek 'tithenai' (to place) and Latin 'facere' (to do, to make), which in turn produced an enormous family of English words through Old French and Latin borrowings, including 'fact', 'feature', and 'affair'.
In Old English, 'dēman' was closely related to the word 'dōm', meaning judgment, decree, or glory — a word preserved today in compounds like 'kingdom' (literally 'king's judgment' or 'king's domain') and in the very name 'Domesday Book', the great survey of England ordered by William the Conqueror in 1086. The Domesday Book was, at its heart, a book of official judgment — a record of what was deemed to belong to whom.
As English evolved through the Middle English period, 'dēman' became 'demen' and gradually settled into its modern form 'deem'. Its meaning narrowed slightly over the centuries. Where once it could mean to judge publicly and formally — as a magistrate might — it came to mean something slightly more internal and personal: to consider, to think, or to regard as. Today it carries a slightly formal or legal flavour, which is a faint echo of its ancient role in the courts and councils of the early Germanic world. When a law states that something 'shall be deemed unlawful', the word is doing exactly what it has always done — delivering a judgment.