to bring (something) into practice or use, esp for the first time
to bring (something) into play
They introduced a new line of approach into the argument
to make (somebody) known, e.g.:
to cause (somebody or oneself) to be acquainted with another person
to present (somebody) formally, e.g. at court or into society
to make preliminary explanatory or laudatory remarks about (e.g. a speaker)
to announce (something, e.g. a piece of legislation) formally or by an official reading
to give (somebody) knowledge of something
I introduced him to the works of Byron
to place or insert (something) into a place
There is a risk of introducing harmful substances into the body
to start (something)
I'd like to introduce this evening's entertainment with a song
to present (a radio or television programme)