E

editAttrLimits 
editDisplayLayerGlobals
editDisplayLayerMembers
editMetadata
editor
editorTemplate
editRenderLayerAdjustment
editRenderLayerGlobals
editRenderLayerMembers
effector
emit
emitter
enableDevice
encodeString
endString 
endsWith 
env
equivalent 
equivalentTol 
erf
error
eval
evalDeferred
evalEcho
event
exactWorldBoundingBox
exclusiveLightCheckBox
exec
executeForEachObject 
exists
exp
exportEdits
expression
expressionEditorListen
extendCurve
extendSurface
extrude

indicates a MEL script