principal minorprincipal moment of inertiaprincipal objectprincipal of a schoolprincipal of informativityprincipal offenderprincipal officeprincipal officerprincipal partsprincipal photographyprincipal planeprincipal plane of stressprincipal pointprincipal quantum numberprincipal rayprincipal scaleprincipal sectionprincipal section or principal or principalprincipal sourceprincipal strainprincipal stressprincipal to principalprincipal to principal tradingprincipal townprincipal transactionprincipal valueprincipal visual rayprincipal vsus agentprincipal’s officeprincipalityprincipality of andorraprincipallyprincipalsprincipalshipprincipateprincipeprincipleprinciple of abstractionprinciple of causalityprinciple of charityprinciple of collegialityprinciple of conservationprinciple of cyclictyprinciple of deformationprinciple of detailed balanceprinciple of detailed balancingprinciple of diminishing returnsprinciple of discriminationprinciple of dualityprinciple of duality connection
