o ice-breaker
o idiomatic expression
o illiteracy
o illiterate
o illustrate
o impression
o impression management
o impromptu speaking
o incoming mail
o independent clause
o index
o individual differences
o inductive approach
o inference
o influence
o informal communication channel
o informal letter
o information
o informational overload
o informative synopsis
o inside address
o interact
o interaction
o intercultural barriers
o intercultural blunder
o intercultural communication
o interjection
o internal communication
o interoffice mail
o interpersonal communication
o interpersonal conflict
o interpreter
o interruption of a conversation
o interview
o introduction
o irrelevant information