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• effective — ef‧fec‧tive [ɪˈfektɪv] adjective 1. working well and producing the result or effect that was wanted or intended: • The company mounted a very effective publicity campaign. • The 7% increase in sales shows that the company has become more… …   Financial and business terms

• effective — late 14c., from Fr. effectif, from L. effectivus productive, effective, from effect , stem of efficere (see EFFECT (Cf. effect)). Effectively in the sense of actually is attested by 1650s. Related: Effectivity …   Etymology dictionary

• effective — ef|fec|tive [ ı fektıv ] adjective *** 1. ) someone or something that is effective works well and produces the result that was intended: Humor is often far more effective than shouting. You need effective communication within the organization.… …   Usage of the words and phrases in modern English

• effective */*/*/ — UK [ɪˈfektɪv] / US adjective 1) a) someone or something that is effective works well and produces the result that was intended You need more effective communication within the organization. Humour is often far more effective than shouting. The… …   English dictionary

• effective — ef|fec|tive W1S2 [ıˈfektıv] adj 1.) successful, and working in the way that was intended ≠ ↑ineffective ▪ The cheaper drugs are just as effective in treating arthritis. ▪ the painting s highly effective use of colour ▪ Training is often much less …   Dictionary of contemporary English

• effective — /I fektIv/ adjective 1 producing the result that was wanted or intended: The ads were simple, but remarkably effective. 2 impressive or interesting enough to be noticed: an effective use of colour 3 (no comparative) if a law, agreement, or system …   Longman dictionary of contemporary English

• effective*/*/*/ — [ɪˈfektɪv] adj 1) working well and producing the result that was intended Ant: ineffective You need more effective communication within the organization.[/ex] This is a very effective way of controlling pests and weeds.[/ex] The new vaccine is… …   Dictionary for writing and speaking English

• effective — adjective 1) an effective treatment Syn: successful, effectual, potent, powerful, helpful, beneficial, advantageous, valuable, useful 2) an effective argument Syn: convincing, compe …   Synonyms and antonyms dictionary

• Effective medium approximations — or effective medium theory (sometimes abbreviated as EMA or EMT) are physical models that describe the macroscopic properties of a medium based on the properties and the relative fractions of its components. They can be discrete models such as… …   Wikipedia

• Effective atomic number — has two different meanings: one that is the effective nuclear charge of an atom, and one that calculates the average atomic number for a compound or mixture of materials. Both are abbreviated Zeff.For an atomThe effective atomic number Zeff,… …   Wikipedia

• Effective nuclear charge — Diagram The effective nuclear charge is the net positive charge experienced by an electron in a multi electron atom. The term effective is used because the shielding effect of negatively charged electrons prevents higher orbital electrons from… …   Wikipedia