Intervening means happening between other things. Middle school is an intervening phase between elementary school and high school.

Intervening is an adjective that comes from the Latin intervenire, from inter-, meaning “between,” and venire, meaning “come.” That which is intervening comes between. The intervening period of your life between high school and college could involve a stint in the circus. You never know.

Definitions of intervening

adj occurring or falling between events or points in time

“so much had happened during the intervening years”
between an earlier and a later period of time

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