A physical base or foundation. / A starting point, base or foundation for an argument or hypothesis. / An underlying condition or circumstance. / A regular frequency.

(anatomy, botany) Positioned at the base; forming a base / (anatomy) Relating to the basion / (chemistry, biology) Relating to bases (substances with pH greater than 7)

(finance) One hundredth of one percentage point.

plural of basis point

(idiomatic) Irregularly, occurring in irregular time intervals or patterns.

(idiomatic) Regularly; occurring in regular time intervals or patterns.

(travel, aviation) An alphanumeric or alphabetic code used to indicate the type of fare used on an airline ticket, even if the fare is not shown.

(finance, accounting, often attributive) A method of accounting that tracks income and expenditure when they become due, rather than when they actually occur.

(finance, accounting, often attributive) A method of accounting that tracks income and expenditure when they actually occur, rather than when they become due.

(algebra, ring theory) A basis of a polynomial ring (said ring being viewed either as a vector space over the field of coefficients or as a free module over the ring of coefficients).