Relating to graduates or graduation; of, concerning, or suitable for people who have completed a degree program.
From 'graduate' plus adjectival suffix '-ical'. This is an archaic or formal variant of the more common adjective 'graduate' (as in 'graduate school').
Words ending in '-ical' are getting rarer in English—we used to say 'graduatical duties' but now say 'graduate duties,' showing how language simplifies by dropping extra syllables over time!
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