Princeton's WordNet

1. baseball, baseball game(noun)

   a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs

   "he played baseball in high school"; "there was a baseball game on every empty lot"; "there was a desire for National League ball in the area"; "play ball!"

2. baseball(noun)

   a ball used in playing baseball

Kernerman English Learner's Dictionary

1. baseball(noun)ˈbeɪsˌbɔl

   a sport in which a batter hits a ball and runs four bases to score

   to play/watch baseball; a baseball game/team

2. baseballˈbeɪsˌbɔl

   a ball used in baseball

   to hit a baseball

Wiktionary

1. baseball(Noun)

   A sport common in North America, the Caribbean, and Japan, in which the object is to strike a ball so that one of a nine-person team can run counter-clockwise among four bases, resulting in the scoring of a run. The team with the most runs after termination of play, usually nine innings, wins.

2. baseball(Noun)

   The ball used to play the sport of baseball.

3. baseball(Noun)

   A variant of poker in which cards with baseball-related values have special significance.

Origin: base + ball

Webster Dictionary

1. Baseball(noun)

   a game of ball, so called from the bases or bounds ( four in number) which designate the circuit which each player must endeavor to make after striking the ball

2. Baseball(noun)

   the ball used in this game

U.S. National Library of Medicine

1. Baseball

   A competitive nine-member team sport including softball.

The Foolish Dictionary, by Gideon Wurdz

1. BASEBALL

   A game in which the young man who bravely strikes out for himself receives no praise for it.

• bofbalAfrikaans
• لُعْبَة البيسبول / كُرة القاعِدَهArabic
• бейзболBulgarian
• basebolPortuguese (BR)
• baseballCzech
• das Baseball(-spiel)German
• baseballDanish
• μπέιζμπολGreek
• béisbolSpanish
• pesapallEstonian
• بیس بالFarsi
• baseballFinnish
• baseballFrench
• בֵּייסבּוֹל, כָּדוּר בָּסִיסHebrew
• बेसबॉलHindi
• bejzbolCroatian
• baseballHungarian
• baseballIndonesian
• hornaboltiIcelandic
• baseballItalian
• 野球Japanese
• 야구Korean
• beisbolasLithuanian
• beisbolsLatvian
• besbolMalay
• honkbalDutch
• baseballNorwegian
• baseballPolish
• بیس بالPersian
• دبيسبال لوبه، نوب ډنډې ته ورته يوه امريكايى لوبهPashto
• baseballPortuguese
• baseballRomanian
• бейсболRussian
• baseballSlovak
• baseballSlovenian
• bezbolSerbian
• baseball, basebollSwedish
• กีฬาเบสบอลThai
• beyzbol(oyunu)Turkish
• 棒球Chinese (Trad.)
• бейсболUkrainian
• پیس بال ، ایک امریکی کھیلUrdu
• bóng chàyVietnamese
• 棒球Chinese (Simp.)