Introduce, v. t. [imp. & p. p. Introduced; p. pr. & vb. n. Introducing.]
Etymology: [L. introducere, introductum; intro within + ducere to lead. See Intro-, and Duke.]
1. To lead or bring in; to conduct or usher in; as, to introduce a person into a drawing-room.
2. To put (something into a place); to insert; as, to introduce the finger, or a probe.
3. To lead to and make known by formal announcement or recommendation; hence, to cause to be acquainted; as, to introduce strangers; to introduce one person to another.
4. To bring into notice, practice, cultivation, or use; as, to introduce a new fashion, method, or plant.
3 more senses
5. To produce; to cause to exist; to induce. [Obs.] Whosoever introduces habits in children, deserves the care and attention of their governors. Locke.
6. To open to notice; to begin; to present; as, he introduced the subject with a long preface.
Syn. -- To bring in; usher in; insert; begin; preface.
Shades of meaning
Fernald has no entry of its own for introduce; he lists it under allege.
Where he writes about it:
Adduce is not used of persons; of them we say introduce or produce. — from allege
When an alleged criminal is brought to trial, the counsel on either side are accustomed to advance a theory, and adduce the strongest possible evidence in its support; they will produce documents and witnesses, cite precedents, assign reasons, introduce suggestions, offer pleas. — from allege