What does "1-d" mean?

A selective service class denoting that the registrant is already a reserve member of the armed forces or a student taking military training, as in ROTC or an accepted aviation cadet applicant.

1-d

adj, noun

adj, noun ·Rare ·Advanced level

Definitions

Noun

1
A selective service class denoting that the registrant is already a reserve member of the armed forces or a student taking military training, as in ROTC or an accepted aviation cadet applicant. uncountable

Adjective

1
Initialism of one-dimensional. abbreviation, alt-of, initialism, not-comparable

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.