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We study the Segal-Bargmann transform, or the heat transform, $H_t$ for acompact symmetric space $M=U/K$. We prove that $H_t$ is a unitary isomorphism$H_t : L^2(M) \to \cH_t (M_\C)$ using representation theory and the restrictionprinciple. We then show that the Segal-Bargmann transform behaves nicely underpropagation of symmetric spaces. If $\{M_n=U_n/K_n,\iota_{n,m}\}_n$ is a directfamily of compact symmetric spaces such that $M_m$ propagates $M_n$, $m\ge n$,then this gives rise to direct families of Hilbert spaces$\{L^2(M_n),\gamma_{n,m}\}$ and $\{\cH_t(M_{n\C}),\delta_{n,m}\}$ such that$H_{t,m}\circ \gamma_{n,m}=\delta_{n,m}\circ H_{t,n}$. We also consider similarcommutative diagrams for the $K_n$-invariant case. These lead to isometricisomorphisms between the Hilbert spaces $\varinjlim L^2(M_n)\simeq \varinjlim\mathcal{H} (M_{n\mathbb{C}})$ as well as $\varinjlim L^2(M_n)^{K_n}\simeq\varinjlim \mathcal{H} (M_{n\mathbb{C}})^{K_n}$.

The Segal–Bargmann Transform on Compact Symmetric Spaces and Their Direct Limits