Answer:

addition

Answer	Crossword Clue
ADDITION	Building wing
ADDITION	Arithmetic problem
ADDITION	First grade topic

ADDITION	Mathematical process.
ADDITION	Something new.
ADDITION	Increase.
ADDITION	Builder's afterthought
ADDITION	Increase
ADDITION	Math process
ADDITION	Home project
ADDITION	Ell, maybe

ADDITION	Blessed event

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.