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A return specialist, subcategorized as kick or punt returners, is a player on the special teams unit of a gridiron football team who specializes in returning kickoffs and punts. There are few players who are exclusively return specialists; most also play another position such as wide receiver, corne…

A silversmith is a metalworker who crafts objects from silver. The terms silversmith and goldsmith are not exact synonyms, as the techniques, training, history, and guilds are (or were, at least) largely the same but differed in that the end product may vary greatly (as may the scale of objects crea…

An innings is one of the divisions of a cricket match during which one team takes its turn to bat. Innings also means the period in which an individual player bats (acts as either striker or nonstriker). In cricket and rounders, "innings" is both singular and plural; this contrasts with baseball and…

All definitions tacitly require the homogeneous relation R {\displaystyle R} be transitive: for all a , b , c , {\displaystyle a,b,c,} if a R b {\displaystyle aRb} and b R c {\displaystyle bRc} then a R c . {\displaystyle aRc.} A term's definition may require additional properties that are not liste…

A catechism ( /ˈkætəˌkɪzəm/; from Ancient Greek: κατηχέω, "to teach orally") is a summary or exposition of doctrine and serves as a learning introduction to the Sacraments traditionally used in catechesis, or Christian religious teaching of children and adult converts. As Daniel R. Hyde has shown, t…

In logic, a logical connective (also called a logical operator, sentential connective, or sentential operator) is an operator that combines or modifies one or more logical variables or formulas, similarly to how arithmetic connectives like + {\displaystyle +} and − {\displaystyle -} combine or negat…

The John D. and Catherine T. MacArthur Foundation is an American private foundation that makes grants and impact investments to support non-profit organizations in approximately 117 countries around the world. As of 2025, the MacArthur Foundation has an endowment of $9 billion and provides hundreds …

In geometry, a straight line, usually abbreviated line, is an infinitely long object with no width, depth, or curvature. It is a special case of a curve and an idealization of such physical objects as a straightedge, a taut string, or a ray of light. Lines are spaces of dimension one, which may be e…

Public health is "the science and art of preventing disease, prolonging life and promoting health through the organized efforts and informed choices of society, organizations, public and private, communities and individuals". Analyzing the determinants of health of a population and the threats it fa…

During the classical period, the Roman Empire controlled the Mediterranean and much of Europe, Western Asia, and North Africa. The Romans conquered most of these territories in the time of the Republic, and it was ruled by emperors following Octavian's assumption of power in 27 BC. Over the 4th cent…