Ma'anar ƙamus na "ma'anar hankali" shine canji a hankali a cikin tattarawar abu a cikin bayani ko cakude a nesa, yawanci daga yanki mai girma zuwa wani yanki mai ƙananan hankali. A wasu kalmomi, yana nufin bambanci a cikin adadin ko tattarawar abu tsakanin yankuna biyu ko maki a sararin samaniya. Sau da yawa ana amfani da shi a cikin mahallin sinadarai, kimiyyar lissafi, da ilmin halitta don bayyana motsin barbashi ko kwayoyin halitta daga wannan wuri zuwa wani.