Yes, RECAPITULATION is a Scrabble word!

Letter values in Scrabble US: R 1, E 1, C 3, A 1, P 3, I 1, T 1, U 1, L 1, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

RECAPITULATION is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

emergence during embryonic development of various characters or structures that appeared during the evolutionary history of the strain or species
(music) the section of a composition or movement (especially in sonata form) in which musical themes that were introduced earlier are repeated
a summary at the end that repeats the substance of a longer discussion
(music) the repetition of themes introduced earlier (especially when one is composing the final part of a movement)