pair of concepts
couple of terms whose meanings depend on each other
a priori and a posteriori
two types of knowledge, justification, or argument
positive and negative predictive values
in biostatistics, proportion of true positive and true negative results
necessity and sufficiency
conditional or implicational relationship between two statements: a necessary condition is one which must be present in order for another condition to occur, while a sufficient condition is one which produces the said condition
precision and recall
measures of relevance in pattern recognition and information retrieval
signified and signifier
concepts in linguistics
positive and negative numbers
mathematical terms
workweek and weekend
parts of the week devoted to labor and rest, respectively
creation and annihilation operators
operators useful in quantum mechanics
nomothetic and idiographic
distinct approaches to knowledge
endocentric and exocentric
distinction between phrases that have a primary word ("head") and that don't
letter and spirit of the law
concepts in philosophy of law
secant and cosecant
trigonometric functions
literal and figurative language
distinction within some fields of language analysis
vices and virtues
artistic theme
cat people and dog people
preference in pets
binary opposition
pair of related terms or concepts that are opposite in meaning
tangent and cotangent
trigonometric functions
sine and cosine
trigonometric functions of an angle
art and nature
literary theme
Form and content
distinct aspects of a work of art
takeoff and landing
method used by an aircraft to depart and return to the ground