{AC is Armor Class, what you need to meet or beat if you where say attacking with a long sword or other similar such melee attack. CMD is combat maneuver defense, the score you need to meet or beat if you where attempting a trip or grapple for instance. ... CMB- combat maneuver bonus=  rolls agains CMD  ]<br/><br/>m<a class="postlink" href="http://paizo.com/pathfinderRPG/prd/gettingStarted.html#_cmd">http://paizo.com/pathfinderRPG/prd/gett ... .html#_cmd</a>mthat link should have most of the terms you may encounter listed on it I believe]<br/><br/><br/>{Being an Alchemist your BAB should be the same as mine,m<a class="postlink" href="http://paizo.com/pathfinderRPG/prd/advanced/baseClasses/alchemist.html">http://paizo.com/pathfinderRPG/prd/adva ... emist.html</a>m, not sure on your strength mod, so for simplicities sake I shall run a few examples using my own stats.]<br/><br/>[ For instance, lets say I wanted to make a grab attack vs the Fiance here, To do so I use my CMB [ strength mod+ Base attack bonus) plus the result of a D20 So my strength is 16, which nets me a +3 mod there, and my BAB(base attack bonus) is also 3, which makes a grand total of +6 So 1d20+6 Vs her CMD of 26{which is massive I must say]<a class="postlink" href="http://orokos.com/roll/108010">Example Grapple roll</a>:<span style="text-decoration: underline">1d20+6</span><span style="font-weight: bold">12</span>so a total of 12,  that would have missed handily XD   (( as a side note it should be mentioned that combat Maneuvers typically provoke attacks of opportunity, a free attack roll essentially,  when used against an armed opponent)) ]<br/><br/>[ If you wanted to however attack her with a melee weapon, we would go against her Armor class. Using A combination of our strength (dex for ranged) mod+ base attack bonus again, 1d20+6{+3 BAB +3 Strength]  vs AC 15<a class="postlink" href="http://orokos.com/roll/108012">Example attack roll</a>:<span style="text-decoration: underline">1d20+6</span><span style="font-weight: bold">15</span>so that would just barely hit XD as it meets or beats their AC. ]<br/><br/><br/>I hope this has helped, and if you have anymore questions in the future, do not hesitate to ask.