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per • pen • dic • u • lar adj., exactly upright. The townspeople of Pisa eventually got used to the idea that buildings need not be perpendicular.

quo • rum n., a select group or company. Dedication enabled her to join the quorum of those who have completed a marathon.

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pro • found adj., very deep or intense. A profound pleasure overcame Branford as he hit upon the solution to the physics problem he had been struggling with all week.

rapt adj., deeply absorbed; engrossed. Pouring over an art book, Julia was rapt in attention.

in • ef • fa • ble adj., incapable of being expressed or described adequately; inexpressible. Joan’s ineffable excitement about getting front-row seats for the Lizard Babies concert was unacceptable to her mother, who demanded, “Well? Say something!”

in • scru • ta • ble adj., completely obscure or mysterious. Geoff concluded that if millions of Romans had mastered Latin, it need not remain inscrutable to him.