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n.
the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close; "he stuck his head in the doorway"
n.
facility consisting of a circumscribed area of land or water laid out for a sport; "the course had only nine holes"; "the course was less than a mile"
n.
something that provides access (to get in or get out); "they waited at the entrance to the garden"; "beggars waited just outside the entryway to the cathedral"
n.
a short note recognizing a source of information or of a quoted passage; "the student's essay failed to list several important citations"; "the acknowledgments are usually printed at the front of a book"; "the article includes mention of similar clinical cases"
n.
a change of position that does not entail a change of location; "the reflex motion of his eyebrows revealed his surprise"; "movement is a sign of life"; "an impatient move of his hand"; "gastrointestinal motility"
n.
a mode of action; "if you persist in that course you will surely fail"; "once a nation is embarked on a course of action it becomes extremely difficult for any retraction to take place"