Noun
Alt. of Dieresis
Source: Webster's dictionaryA proper diaeresis may very exceptionally be seen in elaborated style (for instance: "Aïda"). Source: Internet
English speakers and writers once used the diaeresis more often than now in words such as coöperation (from Fr. coopération), zoölogy (from Grk. Source: Internet
A diaeresis ü indicates that it is not silent as it normally would be (e. Source: Internet
For deity and deify, only solid styling (no hyphen or diaeresis) is normative. Source: Internet
French also uses the diaeresis on the second of two adjacent vowels to indicate that both are pronounced separately, as in Noël "Christmas" and haïr "to hate". Source: Internet
It was formerly common in American English to use a diaeresis mark to indicate a hiatus : for example, coöperate, daïs, reëlect. Source: Internet