prep.
 with the addition of. 
▸informal together with.
adj.
   - 
[postpos.]
 (after a number or amount) at least:![]()  $500,000 plus. ▸(after a grade) rather better than: ![]()  B plus. 
- (before a number) above zero; positive.
- having a positive electric charge.
n.
  - short for plus sign. ▸a mathematical operation of addition. 
- informal an advantage.
conj.
 informal furthermore; also.
Etymology
  C16: from L., lit. ‘more’.