an obstruction that stands in the way (and must be removed or surmounted or circumvented)
something immaterial that stands in the way and must be circumvented or surmounted; "lack of imagination is an obstacle to one's advancement"; "the poverty of a district is an obstacle to good education"; "the filibuster was a major obstruction to the success of their plan"
the act of referring or consulting; "reference to an encyclopedia produced the answer"
the most direct or specific meaning of a word or expression; the class of objects that an expression refers to; "the extension of `satellite of Mars' is the set containing only Demos and Phobos"
the relation between a word or phrase and the object or idea it refers to; "he argued that reference is a consequence of conditioned reflexes"
a publication (or a passage from a publication) that is referred to; "he carried an armful of references back to his desk"; "he spent hours looking for the source of that quotation"
condition of heightened watchfulness or preparation for action; "bombers were put on alert during the crisis"
very attentive or observant; "an alert and responsive baby is a joy"; "caught by a couple of alert cops"; "alert enough to spot the opportunity when it came"; "constantly alert and vigilant, like a sentinel on duty"
(usually followed by `to') showing acute awareness; mentally perceptive; "alert to the problems"; "alive to what is going on"; "awake to the dangers of her situation"; "was now awake to the reality of his predicament"
not unconscious; especially having become conscious; "the patient is now awake and alert"
American musteline mammal typically ejecting an intensely malodorous fluid when startled; in some classifications put in a separate subfamily Mephitinae
the act of delivering a blow with the foot; "he gave the ball a powerful kick"; "the team's kicking was excellent"
a rhythmic thrusting movement of the legs as in swimming or calisthenics; "the kick must be synchronized with the arm movements"; "the swimmer's kicking left a wake behind him"
the sudden stimulation provided by strong drink (or certain drugs); "a sidecar is a smooth drink but it has a powerful kick"
make a goal; "He kicked the extra point after touchdown"
stop consuming; "kick a habit"
strike with the foot; "The boy kicked the dog"; "Kick the door down"