diaeresis or dieresis /dī-ērˈi-sis or -erˈ/

1. A mark ( ¨ ) placed over a vowel, esp the second of two adjacent ones to show that it is to be pronounced separately, as in naïf
2. A pause or break where the end of the word coincides with the end of a foot (prosody)

• infobahns
• in focus
• infographic
• infographics
• infold
• infolded
• infolding
• infoldings
• infolds
• in folio
• infomania
• infomanias
• infomercial
• infomercials
• infopreneurial
• in for
• in for a penny, in for a pound
• in force
• inforce
• in for it
• inform
• informal
• informalities
• informality
• informally