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loggerhead any of various very large sea turtles with large beaked heads, esp. a carnivorous sea turtle of the southern and western Atlantic. [2 definitions]
loggia a roofed gallery, arcade, or porch with at least one open side, esp. one that serves as an entrance space or one on an upper level.
logging the work or business of felling trees, trimming and cutting them into logs, and transporting these to a sawmill.
logic reasoning, or the study of reasoning. [4 definitions]
-logical of or relating to the science, study, or principles of; -logic.
logical in accord with the rules of logic. [3 definitions]
logical positivism a movement in philosophy that views philosophy as a way of analyzing and criticizing science, and that holds that all statements not based on observation, experience, or the rules of language are meaningless.
logician one who has expert knowledge of formal logic.
log in to authenticate one's identity in order to start using a computer or network, usually by entering a user name and password recognized by the computer.
logistics (used with a sing. or pl. verb) the aspect of military science relating to the procurement and distribution of equipment and supplies and the maintenance and transportation of troops. [2 definitions]
logjam an immovable mass or tangle of floating logs on a river or stream. [2 definitions]
logo a logotype.
log off to command a computer to end an activity.
logogram a symbol or sign used to represent an entire spoken word.
logogriph a word puzzle.
logomachy an argument about words. [3 definitions]
log on to enter a computer system with a password.
logorrhea incoherent, excessive speech.
logotype a single piece of type that carries two or more usu. separate letters or elements. [2 definitions]
logroll to obtain the passage of (a bill) by political logrolling. [2 definitions]
logrolling the action of rolling floating logs with one's feet, esp. as a game of skill; birling. [2 definitions]