An IMaterialDefinition object represents a material definition in the game. A Material Definition is needed if you want to create a new block.

It might be required for you to import the package if you encounter any issues, so better be safe than sorry and add the import.
import mods.contenttweaker.BlockMaterial;

You can get such an object using the Block Material Bracket Handler:
<blockmaterial:wood>

ZenGetter	ZenMethod	Rückgabetyp
ZenGetter blocksLight	ZenMethod blocksLight()	Rückgabetyp bool
ZenGetter blocksMovement	ZenMethod blocksMovement()	Rückgabetyp bool
ZenGetter canBurn	ZenMethod getCanBurn()	Rückgabetyp bool
ZenGetter mobilityFlag	ZenMethod getMobilityFlag()	Rückgabetyp PushReaction
ZenGetter liquid	ZenMethod isLiquid()	Rückgabetyp bool
ZenGetter opaque	ZenMethod isOpaque()	Rückgabetyp bool
ZenGetter replaceable	ZenMethod isReplaceable()	Rückgabetyp bool
ZenGetter solid	ZenMethod isSolid()	Rückgabetyp bool
ZenGetter toolNotRequired	ZenMethod isToolNotRequired()	Rückgabetyp bool

You can use the == operator to see if two MaterialDefinitions are equal

ZenScript
 Copy
if(materialA == materialB)
    print("success!");