The act or process of alighting; a descent or settling upon something, the state of having landed or come to rest.
From 'alight' + '-ment' (noun suffix creating abstract nouns from verbs). This follows the pattern of words like 'movement' and 'settlement' that describe the result or process of actions.
The suffix '-ment' turns verbs into nouns representing the process or result—movement, amazement, replacement. 'Alightment' is archaic because modern English prefers 'landing,' showing how word fashions change over centuries.
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