salutatory (adj.)

1690s, "pertaining to a salutation," from Latin salutatorius "pertaining to visiting or greeting," from salut-, past participle stem of salutare "to greet" (see salute (v.)). From 1702 in reference to an address which welcomes those attending commencement exercises.

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Definitions of salutatory from WordNet

salutatory (n.)
an opening or welcoming statement (especially one delivered at graduation exercises);
Synonyms: salutatory address / salutatory oration