All Greek verbs are listed in one of three various forms:
       1) V-tense-voice-mood
       2) V-tense-voice-mood-person-number
       3) V-tense-voice-mood-case-number-gender

The abbreviations which pertain to each of these categories are the  following:
Tense:
    P          = Present
    I          = Imperfect
    F          = Future                 Second Future     =  2F
   A          = Aorist                 Second Aorist     =   2A
   R          = peRfect               Second peRfect    =  2R
    L          = pLuperfect          Second pLuperfect = 2L
    X          = adverbial imperative

Voice:
    A          = Active
    M          = Middle
    P          = Passive
    E          = Either middle or passive
    D          = middle Deponent
    O          = passive depOnent
    N          = middle or passive depoNent
    Q          = impersonal active
    X          = no voice stated

Mood:
      I          = Indicative
     S          = Subjunctive
     O          = Optative
     M          = iMperative
     N          = iNfinitive
     P          = Participle
     R          = impeRative-sense participle

Extra:
     -M         = Middle significance
     -C         = Contracted form
     -T         = Transitive
     -A         = Aeolic
     -ATT       = Attic
     -AP        = Apocopated form
     -IRR       = Irregular or Impure form

Person: 1, 2, 3   = First, Second, Third person

Number: S, P      = Singular, Plural

Gender: M, F, N   = Masculine, Feminine, Neuter

Case:
     N          = Nominative      (5-case system only!)
     G          = Genitive
     D          = Dative
     A          = Accusative
     V          = Vocative